20240528IPC to Staff No 22 Attachment.pdf

Technical Reference Manual Multifamily 1 .0
Prepared for
Idaho Power Company
September 20th, 2023
Prepared by:
R
ADM Associates, Inc.
3239 Ramos Circle
Sacramento, CA 95827
(916) 363-8383
Chapter Title i

Table of Contents
1. Overview and Purpose of Deemed Savings Method...................................................... 6
1.1. Purpose...................................................................................................................... 6
1.2. Methodology and Framework ..................................................................................... 6
1.3. Weather Data Used for Weather Sensitive Measures................................................. 7
1.4. Peak Demand Savings and Peak Demand Window Definition.................................... 9
1.5. Building Type by Measure .........................................................................................10
2. Multifamily Deemed Savings Measures.........................................................................12
2.1. Ductless Heat Pumps................................................................................................13
2.2. Air Source HVAC units ..............................................................................................18
2.3. PTAC and PTHP .......................................................................................................25
2.4. Ventilating Bathroom Exhaust Fan.............................................................................31
2.5. Spa Covers................................................................................................................35
2.6. Pool Covers...............................................................................................................38
2.7. Efficient Windows ......................................................................................................41
2.8. Ceiling Insulation .......................................................................................................45
2.9. Floor Insulation..........................................................................................................51
2.10. Reflective Roof..........................................................................................................57
3. Appendix A: Document Revision History......................................................................60
i

List of Figures
Figure 1-1 Map of Idaho Power Company Service Territory....................................................... 7
Figure 1-2 Map Illustrating ASHRAE Weather Zones................................................................. 8
Figure 1-3 Comparison of Monthly Average Temperatures........................................................ 9
Figure 1-4 Hypothetical Hourly Savings Profile Used to Illustrate Calculation of Coincidence
Factor................................................................................................................................10
ii

List of Tables
Table 1-1 Building Type and Location.......................................................................................11
Table 2-1 Typical Savings Estimates for New Construction Ductless Heat Pumps Idaho..........13
Table 2-2 Typical Savings Estimates for Retrofit Ductless Heat Pumps Idaho ..........................13
Table 2-3 Typical Savings Estimates for New Construction Ductless Heat Pumps Oregon.......14
Table 2-4 Typical Savings Estimates for Retrofit Ductless Heat Pumps Oregon .......................14
Table 2-5 Stipulated Equivalent Full Load Hours (EFLH) by Building Type ...............................17
Table 2-6 HVAC Coincidence Factors by Building Type............................................................17
Table 2-7 Typical Savings Estimates for New Construction CEE Tier 1, Idaho .........................18
Table 2-8 Typical Savings Estimates for New Construction CEE Tier 2, Idaho .........................19
Table 2-9 Typical Savings Estimates for Retrofit CEE Tier 1, Idaho..........................................19
Table 2-10 Typical Savings Estimates for Retrofit CEE Tier 2, Idaho........................................20
Table 2-11 Typical Savings Estimates for New Construction CEE Tier 1, Oregon.....................20
Table 2-12 Typical Savings Estimates for New Construction CEE Tier 2, Oregon.....................21
Table 2-13 Typical Savings Estimates for Retrofit CEE Tier 1, Oregon .....................................21
Table 2-14 Typical Savings Estimates for Retrofit CEE Tier 2, Oregon .....................................22
Table 2-15 Stipulated Equivalent Full Load Hours (EFLH) by Building Type .............................24
Table 2-16 HVAC Coincidence Factors by Building Type..........................................................24
Table 2-17 Typical Savings Estimates for New Construction High Efficiency, PTHP with Different
BaselineUnits, Idaho ........................................................................................................25
Table 2-18 Typical Savings Estimates for Retrofit High Efficiency, PTHP with Different Baseline
Units, Idaho.......................................................................................................................26
Table 2-19 Typical Savings Estimates for High Efficiency, PTAC, Idaho...................................26
Table 2-20 Typical Savings Estimates for New Construction High Efficiency, PTHP with Different
Baseline Units, Oregon .....................................................................................................27
Table 2-21 Typical Savings Estimates for Retrofit High Efficiency, PTHP with Different Baseline
Units, Oregon....................................................................................................................27
Table 2-22 Typical Savings Estimates for High Efficiency, PTAC, Oregon................................28
Table 2-23 Stipulated Equivalent Full Load Cooling and Heating Hours (EFLH) by Building Type
..........................................................................................................................................30
Table 2-24 HVAC Coincidence Factors by Building Type..........................................................30
Table 2-25 Typical Saving Estimate for New Construction Manual Exhaust Fan.......................31
iii

Table 2-26 Typical Saving Estimate for Retrofit Manual Exhaust Fan .......................................31
Table 2-27 Typical Saving Estimate for New Construction Continuous Exhaust Fan ................32
Table 2-28 Typical Saving Estimate for Retrofit Continuous Exhaust Fan.................................32
Table 2-29 Continuous Exhaust Fan Deemed Variables...........................................................34
Table 2-30 Continuous Exhaust Fan Deemed Variables...........................................................34
Table 2-31 Typical Saving Estimate for Efficient Spa Covers, Idaho.........................................35
Table 2-32 Typical Saving Estimate for Efficient Spa Covers, Oregon ......................................35
Table 2-33 Standard Spa Cover Deemed Variables..................................................................37
Table 2-34 Annual Summation of Hour Temperature Difference by Weather Zone...................37
Table 2-35 Typical Saving Estimate for Outdoor Pool Covers, Idaho ........................................38
Table 2-36 Typical Saving Estimate for Outdoor Pool Covers, Oregon .....................................38
Table 2-37 Typical Saving Estimate for Indoor Pool Covers......................................................39
Table 2-38 Deemed Savings for Outdoor Pool Covers by Zone and Heater Type.....................40
Table 2-39 Typical Savings Estimates for Efficient Windows with Electric Resistance Heating,
Idaho.................................................................................................................................41
Table 2-40 Typical Savings Estimates for Efficient Windows with Heat Pump Heating, Idaho...42
Table 2-41 Typical Savings Estimates for Efficient Windows with Electric Resistance Heating,
Oregon..............................................................................................................................42
Table 2-42 Typical Savings Estimates for Efficient Windows with Heat Pump Heating, Oregon42
Table 2-43 Window Tier Efficiency Requirements.....................................................................44
Table 2-44 Deemed Savings per Sq. Ft. ...................................................................................44
Table 2-45 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Idaho...............45
Table 2-46 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Idaho..45
Table 2-47 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Oregon............46
Table 2-48 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Oregon
..........................................................................................................................................46
Table 2-49 Typical Savings Estimates for New Construction Heat Pump Heated Spaces, Idaho
..........................................................................................................................................46
Table 2-50 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Idaho.................................................................................................................................47
Table 2-51 Typical Savings Estimates for New Construction Heat Pump Heated Spaces, Oregon
..........................................................................................................................................47
iv

Table 2-52 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Oregon..............................................................................................................................47
Table 2-53 Standard System Variables.....................................................................................49
Table 2-54 Weather Zone Dependent Variables .......................................................................50
Table 2-55 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Idaho...............51
Table 2-56 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Idaho..51
Table 2-57 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Oregon............52
Table 2-58 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Oregon
..........................................................................................................................................52
Table 2-59 Typical Savings Estimates for New Construction Heat Pump Heated Spaces, Idaho
..........................................................................................................................................52
Table 2-60 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Idaho.................................................................................................................................53
Table 2-61 Typical Savings Estimates for New Construction Heat Pump Heated Spaces, Oregon
..........................................................................................................................................53
Table 2-62 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Oregon..............................................................................................................................53
Table 2-63 Standard System Variables.....................................................................................55
Table 2-64 Weather Zone Dependent Variables .......................................................................56
Table 2-65 Summary Deemed Savings Estimates for Reflective Roof, Idaho ...........................57
Table 2-66 Summary Deemed Savings Estimates for Reflective Roof, Oregon.........................57
Table 2-67 Weather Zone Dependent Variables .......................................................................59
Table 2-68 Deemed Savings by Weather Zone.........................................................................59
Table 3-1 Document Revision History.......................................................................................60
V

1 . Overview and Purpose of Deemed Savings Method
This Technical Reference Manual (TRM) is a compilation of stipulated algorithms and values for
various energy efficiency measures implemented by Idaho Power Company's Multifamily demand
side management programs and serves the New Construction and Retrofit programs by providing
up to date savings estimates for the energy efficiency measures offered by the programs. This
manual is intended to facilitate the cost effectiveness screening, planning, tracking, and energy
savings reporting for the New Construction and Retrofit Energy Efficiency incentive programs.
While the algorithms and stipulated values contained in this TRM are derived using best practices,
the stipulated values should be reviewed and revised according to relevant industry research and
impact evaluation findings as necessary to ensure that they remain accurate for the New
Construction and Retrofit programs. The following sections describe many of the processes and
cross-cutting assumptions used to derive the measure level savings estimates found in Section
2.
1.1. Purpose
This manual is intended to facilitate the cost effectiveness screening, planning, tracking, and
energy savings reporting for the New Construction and Retrofit energy efficiency incentive
programs. This document is intended to be a living document in which the stipulated values are
revised according to relevant industry research and impact evaluation findings.
1.2. Methodology and Framework
The algorithms and stipulated values contained in this TRM are derived using current industry
standard engineering best practices. Current relevant research, recent impact evaluations, and
Technical Reference Manuals developed for other states and/or regions are referenced where
appropriate. All energy savings algorithms in this TRM are designed to be applied using the simple
engineering formulas defined for each measure in conjunction with the included stipulated values.
Each measure is presented first with a summary of the technology and typical expected (per unit)
energy savings, expected useful life, and incremental cost estimates. The `typical' per unit values
leverage basic assumptions regarding the geographic distribution of program participants (e.g.
weather zone) as well as participant demographics (for example distribution of building types,
efficiency of current building stock, etc.). Each measure is accompanied by a spreadsheet
calculator containing live formulas and all weights used to derive the typical per-unit estimates. It
is expected that as better information is made available regarding program participants, or as
program designs are adjusted these numbers will be updated accordingly.
Following the measure summary information, each measure section provides a description of its
scope and the spectrum of eligible projects/equipment to which the algorithms and values apply.
When applicable, a discussion of code compliance topics (for new construction projects) is
included.
Overview and Purpose of Deemed Savings Method 6

1.3. Weather Data Used for Weather Sensitive Measures
The service territory for Idaho Power Company covers much of southern Idaho and stretches into
eastern Oregon. This is illustrated in Figure 1-1.In order to normalize expected annual energy
savings and peak demand reductions for annual variations in weather patterns, all stipulated
values for weather sensitive measures were derived using the industry standard Typical
Meteorological Year (TMY3) weather data. While there are many weather stations in Idaho for
which TMY3 data is available, it was determined that averaging the TMY3 weather across stations
in three ASHRAE weather zones (zones 5, 6, and Oregon) provided sufficient resolution without
adding too many separate variations for stipulated values reported in the TRM.
Service Area
Salmon
South-East
• Region
McCall
•
Canyon-West cascade
Region
Ontario •Payette
Vale• •
Emmett
1 Caldwell Halley
• •
• •Bolse
I Nampa
Capital
R E G O N Region Blackfoot
iMountain Home Gooding
• Pocatello
i Jerome South-East • •
I • Region American Falls
1 Twin Falls
1
I
I `
Figure 1-1 Map of Idaho Power Company Service Territory'
All stipulated values for weather sensitive measures (e.g. Equivalent Full Load Cooling Hours)
are based on `typical' weather data and provided separately for each of these two weather zones.
A map of the ASHRAE weather zones is provided in Figure 1-2. When separate savings estimates
are provided for different weather zones, the project location should be used to determine which
of the values are applicable. The `typical' energy savings values reported at the beginning of each
measure's section assumes a weighted average between the three weather zones using weights
of 77.5%, 17.5%, and 5% for Zones 5, 6, and Oregon respectively.
Map represents service territory at the time of this publication.
Overview and Purpose of Deemed Savings Method 7

ine iC1j Dry fBi Nl IA"I
a., 6 1.: .•4s :.r f
r
5
5 �J �_ r
f-•
9oroupn..,7enAa.
NortMtu Arne
F N.Str V LA lympon eM 1
xop►M
Noi�P 7YaM YAM rre dv Vim• 61anb I 1
Figure 1-2 Map Illustrating ASHRAE Weather Zones2
While reviewing the weather data it was noted that while both weather zones are 'heating
dominated' Weather Zone 6 is on average cooler that Weather Zone 5. Therefore, energy
conservation measures targeting heating efficiency tend to perform much better in Zone 6.
However; measures which result in a heating penalty tend to perform better in Zone 5. Monthly
average dry bulb temperatures are compared for both weather zones in Figure 1-3.
z Note how Idaho is bisected by Zones 5 and 6
Overview and Purpose of Deemed Savings Method 8

Comparison of Monthly Average Temperatures
for Weather Zones 5 and 6
60-
d
Weather Zone
Y 40- ZONE5
PZONE6
Q
E
20-
0
1 2 3 4 5 6 7 8 9 10 11 12
Month
Figure 1-3 Comparison of Monthly Average Temperatures
1.4. Peak Demand Savings and Peak Demand Window Definition
Where applicable peak demand savings estimates are derived using Idaho Power Company's
peak period definition of: weekdays from 12:00 PM to 8:00 PM, June 1 through August 31. Hourly
savings estimates are averaged over the aforementioned time period to report peak savings.
Coincidence Factors for Lighting
Coincidence factors are defined as the percentage of the demand savings which occur during
Idaho Power Company's peak period (defined above). When hourly data are available these are
calculated by averaging the hourly demand savings over the peak period definition. This is
exemplified in Figure 1-4 which illustrates a hypothetical hourly savings profile. The highlighted
region bounds the peak period definition and the CF is calculated by taking the average demand
reduction during that period divided by the max demand reduction
Overview and Purpose of Deemed Savings Method 9

12
Maximum Demand Savings
10
Y_
8
O
u
3
6
tic 4
E
v
2 Peak Demand Window
0
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
Hour Of The Day
Figure 1-4 Hypothetical Hourly Savings Profile Used to Illustrate Calculation of Coincidence
Factor
Thus in the example above let's suppose that the maximum Demand savings are 10 kW and the
average kW reduction in the shaded area is 6 kW. The coincidence factor is calculated as follows:
Average Reduction 6 kW
Coincidence Factor = 6
Max Reduction 10 kW
1.5. Building Type by Measure
This TRM estimates the facility energy savings for each measure using deemed values where
applicable. Because of how various measure savings are sourced and calculated, all building
types are not present for all measures. When applying for measure savings, the building type that
most closely resembles the stated facility should be used and should be consistent for all
measures being implemented at the same facility. Table 1-1 helps combine the building types
listed for HVAC and Lighting measures. This table can be used to select a single building type
from either list and lookup the appropriate building type label in the other measure.
Overview and Purpose of Deemed Savings Method 10

Table 1-1 Building Type and Location
Idaho4 Oregon
Building Type' HVAC HVAC HVAC HVAC
Cooling Heating Cooling Heating
EFLH EFLH EFLH EFLH
Low Rises 469 679 287 929
High Rise 896 338 764 516
3 Typical savings values are calculated using an average of the low and high rise building types. For more precise estimates, use the
savings algorithms and provided deemed numbers.
4 Idaho combined hours are weighted 80/20 for zone 5,and 6 respectively.
s Low rise is defined as any building with less than 5 stories above ground.
Overview and Purpose of Deemed Savings Method 11

2. Multifamily Deemed Savings Measures
This chapter contains the protocols and stipulated values for multifamily measures covered by
this TRM. Spreadsheets were developed for each measure and contain any calculations used to
derive stipulated values (or deemed savings estimates). Each measure is presented first with a
summary of the technology and typical expected (per unit) energy savings, expected useful life,
and incremental cost estimates. The `typical' per unit values leverage basic assumptions
regarding the geographic distribution of program participants (e.g. weather zone) as well as
participant demographics (for example distribution of building types, efficiency of current building
stock, etc.) and are intended for use in cost effectiveness screening — not as deemed savings
estimates (given their generality). Where applicable, deemed savings estimates are provided for
various scenario in tables at the end of each measure's section. Most deemed saving values are
rounded and may cause the combined totaled value to not match the values above, (e.g. heating
and cooling numbers combined total not matching the stated total).
Each measure is accompanied by a spreadsheet calculator containing live formulas and all
weights used to derive the typical per-unit estimates. It is expected that as better information is
made available regarding program participants, or as program designs are adjusted these
numbers will be updated accordingly. Following the measure summary information, each measure
section provides a description of its scope and the spectrum of eligible projects/equipment to
which the algorithms and values apply. When applicable, a discussion of code compliance topics
(for new construction projects) is included. It should also be noted that while savings estimates
are provided for a multitude of measures (both for retrofit and new construction) a custom
engineering analysis should be preferred for significantly large projects when possible.
Commercial and Industrial Deemed Savings Measures 12

2.1. Ductless Heat Pumps
The following algorithms and assumptions are applicable to ductless heat pump units installed in
multifamily spaces. This measure applies to projects which represent either equipment retrofit or
new construction (including major renovations). Table 2-1 through Table 2-4 summarize the
`typical' expected (per ton) unit energy impacts for this measure broken out by the baseline
assumption. Typical values are based on algorithms and stipulated values described below and
data from past program participants.' Note that the values listed in the tables below are averaged
across each of the system efficiency and tonnage categories offered by the program.
Table 2-1 Typical Savings Estimates for New Construction Ductless Heat Pumps Idaho
Ductless Ductless
Mini-Spit HP Ductless Mini-Spit Mini-Spit
base Gas base ER base
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 94 kWh 94 kWh 94 kWh
Average Unit Energy Savings (Heating) 82 kWh 0 kWh 685 kWh
Average Unit Energy Savings (Combined) 176 kWh 94 kWh 779 kWh
Average Unit Peak Demand Savings (Cooling) 173 W 173 W 173 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $786 $858 $858
Stacking Effect End-Use HVAC
Table 2-2 Typical Savings Estimates for Retrofit Ductless Heat Pumps Idaho
Ductless Ductless
Mini-Spit HP Ductless Mini-Spit Mini-Spit
base Gas base ER base
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 128 kWh 128 kWh 128 kWh
Average Unit Energy Savings (Heating) 125 kWh 0 kWh 685 kWh
Average Unit Energy Savings (Combined) 252 kWh 128 kWh 812 kWh
Average Unit Peak Demand Savings (Cooling) 234 W 234 W 234 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost $1766 $1766 $1766
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
e See spreadsheet "1-TypicalCalcs_DuctlessHP_MF_v1.xlsx" for assumptions and calculations used to estimate the typical unit
energy savings and incremental costs.
Ductless Heat Pumps 13

Table 2-3 and Table 2-4 show deemed savings for the Oregon territory.
Table 2-3 Typical Savings Estimates for New Construction Ductless Heat Pumps Oregon
Ductless Ductless
Mini-Spit HP Ductless Mini-Spit Mini-Spit
base Gas base ER base
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 72 kWh 72 kWh 72 kWh
Average Unit Energy Savings (Heating) 117 kWh 0 kWh 973 kWh
Average Unit Energy Savings (Combined) 189 kWh 72 kWh 1,045 kWh
Average Unit Peak Demand Savings (Cooling) 173 W 173 W 173 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $786 $858 $858
Stacking Effect End-Use HVAC
Table 2-4 Typical Savings Estimates for Retrofit Ductless Heat Pumps Oregon
Ductless Ductless
Mini-Spit HP Ductless Mini-Spit Mini-Spit
base Gas base ER base
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 98 kWh 98 kWh 98 kWh
Average Unit Energy Savings (Heating) 177 kWh 0 kWh 973 kWh
Average Unit Energy Savings (Combined) 275 kWh 98 kWh 1,071 kWh
Average Unit Peak Demand Savings (Cooling) 234 W 234 W 234 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost $1766 $1766 $1766
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
2.1.1. Definition of Eligible Equipment
All ductless heat pump systems under 5 tons cooling capacity are eligible provided the installed
equipment meets or exceeds ENERGYSTAR ductless heat pump requirements. Note that
projects replacing pre-existing A/C only units with heat-pump units are eligible under this
measure. In such project the heating component must use a new construction baseline whereas
the cooling component can use either (retrofit or new construction) baselines as deemed
appropriate. Eligibility is determined by calculating the EER, SEER, and/or HSPF as appropriate
for the installed unit.
Ductless Heat Pumps 14

2.1.2. Definition of Baseline Equipment
Baseline equipment for this measure is determined by the nature of the project. There are two
possible scenarios: retrofit (early replacement) or New construction.
Retrofit (Early Replacement)
If the project is retrofitting pre-existing equipment in working condition, then the baseline efficiency
is defined by the pre-existing equipment. If the equipment being replaced is not in working order,
then this is considered "replace on burn-out" and the baseline becomes new construction.
New Construction (Includes Major Remodel & Replace on Burn-Out)
For New Construction, the baseline efficiency is defined as the minimum allowable EER by the
prevailing building energy code or standard according to which the project was permitted. Current
applicable standards are defined by ASHRAE 90.1-2019. Recently Idaho adopted IECC 2018 as
the energy efficiency standard for new construction.
2.1.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
OkWh = OkWhcoot + OkWhHeat
= Cap * (1/SEERbase,cool- 1/SEERInstaued,cool) / 1000 * EFLHcoo/* DF +
Cap * (1/HSPFbase,Heat— 1/HSPFInstalled,Heat) / 1000 * EFLHHeat *DF
AkWpeak = Cap * (1/EERbase,cool— 1/EERInst.Iled,cool) / 1000 * CF
2.1.4. Definitions
OkWh Expected energy savings between baseline and installed equipment.
OkWpeak Expected peak demand savings.
EFLH Equivalent full load cooling/heating hours of Idaho specific EFLH are by weather zone
and building in Table 2-5.
CF Peak coincidence factor. Represents the % of the connected load reduction which
occurs during Idaho Power's peak period. Table 2-6
EER Energy Efficiency Ratio for base and installed systems in cooling and heating modes.
This is defined as the ratio of the cooling capacity of the air conditioner in British
Thermal Units per hour, to the total electrical input in watts. Since ASHRAE does not
provide EER requirements for air-cooled air conditioners < 65,000 Btu/h, assume the
following conversion:
Ductless Heat Pumps 15

EER = -0.02 *SEER2 + 1.12 *SEER
SEER Seasonal Energy efficiency ratio of the air conditioning unit. This is defined as the
ratio of the Annual cooling provided by the air conditioner (in BTU/hr), to the total
electrical input (in Watts). Note that the IEER is an appropriate equivalent. If the
SEER or IEER are unknown or unavailable use the following formula to estimate from
the EER:'
SEER = .0507 * EER2 + .5773 * EER + .4919
HSPF Heating Season Performance Factor. This is identical to the SEER(described above)
as applied to Heat Pumps in heating mode. If only the heat pump COP is available,
then use the following:
HSPF = .5651 * COP2 + .464 * COP + .4873
Cap Nominal cooling capaity in kBTU/Hr (1 ton = 12,000BTU/Hr)
DF Discount factor for reduced savings pertaining to high efficiency HVAC units based
on actual energy saving studies. (Default 0.55)
2.1.5. Sources
■ ENERGYSTAR Ductless Heat Pump Requirements and list of qualified products
■ New York Standard Approach for Estimating Energy Savings from Energy Efficiency
Programs — Residential, Multi-Family, and Commercial/Industrial Measures, Version 9
■ California DEER Effective Useful Life worksheets: EUL_Summary_10-1-08. California
DEER Incremental Cost worksheets: Revised DEER Measure Cost Summary
(05_30_2008) Revised (06_02_2008).xls
■ I ECC 2018
2.1.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Note that this formula is an approximation and should only be applied to EER values up to 15 EER.
Ductless Heat Pumps 16

Table 2-5 Stipulated Equivalent Full Load Hours (EFLH) by Building Type'
Zone 5 Zone 6 Oregon
Building Type EFLH EFLH EFLH EFLH EFLH EFLH
Cooling Heating Cooling Heating Cooling Heating
Low Rise 488 622 394 903 287 929
High Rise 910 298 842 498 764 516
Table 2-6 HVAC Coincidence Factors by Building Type
Building Type Coincidence Factor
Low Rise 0.69
High Rise 0.69
a Idaho specific heating and cooling equivalent full load hours were calculated by weather normalizing data from the New York State
TRM for multifamily EFLH values.
Ductless Heat Pumps 17

2.2. Air Source HVAC units
The following algorithms and assumptions are applicable to air source heat pump and air
conditioning units installed in multifamily spaces. This measure applies to projects which
represent either equipment retrofit or new construction (including major renovations). Air source
air conditioning units can only claim savings for cooling savings.
Table 2-7 through Table 2-14 summarize the `typical' expected (per ton) unit energy impacts for
this measure broken out by the baseline assumption. Typical values are based on algorithms and
stipulated values described below and data from past program participants.' Note that Table 2-7
reports the incremental savings and costs associated with going from CEE Tier 1 to CEE Tier 2
and are therefore additive with the appropriate baseline value based on the product.
Typical Savings are split into two regions, Idaho and Oregon. Table 2-7 through Table 2-10 refer
to Idaho and Table 2-11 through Table 2-14 refer to Oregon.
Table 2-7 Typical Savings Estimates for New Construction CEE Tier 1, Idaho
HVAC Unit w/ HVAC Unit w/ HVAC Unit w/
HP Baseline Gas Baseline Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 0 kWh 0 kWh 0 kWh
Average Unit Energy Savings (Heating) 0 kWh 0 kWh 602 kWh
Average Unit Energy Savings (Combined) 0 kWh 0 kWh 602 kWh
Average Unit Peak Demand Savings (Cooling) 0 W 0 W 0 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $0 $72 $72
Stacking Effect End-Use HVAC
9 See spreadsheet "2-TypicalCalcs_AirSourceHP_MF_v1.xlsx" for assumptions and calculations used to estimate the typical unit
energy savings and incremental costs.
Air-Source Heat Pumps 18

Table 2-8 Typical Savings Estimates for New Construction CEE Tier 2, Idaho
HVAC Unit w/ HVAC Unit w/ HVAC Unit w/
HP Baseline Gas Baseline Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 19 kWh 19 kWh 19 kWh
Average Unit Energy Savings (Heating) 8 kWh 0 kWh 611 kWh
Average Unit Energy Savings (Combined) 27 kWh 19 kWh 630 kWh
Average Unit Peak Demand Savings (Cooling) 35 W 35 W 35 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $124 $124 $124
Stacking Effect End-Use HVAC
Table 2-9 Typical Savings Estimates for Retrofit CEE Tier 1, Idaho
HVAC Unit w/ HVAC Unit w/Gas HVAC Unit
HP Baseline Baseline w/ Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 33 kWh 33 kWh 33 kWh
Average Unit Energy Savings (Heating) 42 kWh 0 kWh 602 kWh
Average Unit Energy Savings (Combined) 76 kWh 33 kWh 636 kWh
Average Unit Peak Demand Savings (Cooling) 0 W 61 W 61 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost $980 $980 $980
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Air-Source Heat Pumps 19

Table 2-10 Typical Savings Estimates for Retrofit CEE Tier 2, Idaho
HVAC Unit w/ HVAC Unit w/Gas HVAC Unit
HP Baseline Baseline w/ Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 52 kWh 52 kWh 52 kWh
Average Unit Energy Savings (Heating) 51 kWh 0 kWh 611 kWh
Average Unit Energy Savings (Combined) 103 kWh 52 kWh 663 kWh
Average Unit Peak Demand Savings (Cooling) 96 W 96 W 96 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost $1032 $1032 $1032
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-11 Typical Savings Estimates for New Construction CEE Tier 1, Oregon
HVAC Unit w/ HVAC Unit w/ HVAC Unit w/
HP Baseline Gas Baseline Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 0 kWh 0 kWh 0 kWh
Average Unit Energy Savings (Heating) 0 kWh 0 kWh 856 kWh
Average Unit Energy Savings (Combined) 0 kWh 0 kWh 856 kWh
Average Unit Peak Demand Savings (Cooling) 0 W 0 W 0 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $0 $72 $72
Stacking Effect End-Use HVAC
Air-Source Heat Pumps 20

Table 2-12 Typical Savings Estimates for New Construction CEE Tier 2, Oregon
HVAC Unit w/ HVAC Unit w/ HVAC Unit w/
HP Baseline Gas Baseline Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 14 kWh 14 kWh 14 kWh
Average Unit Energy Savings (Heating) 12 kWh 0 kWh 868 kWh
Average Unit Energy Savings (Combined) 26 kWh 14 kWh 883 kWh
Average Unit Peak Demand Savings (Cooling) 35 W 35 W 35 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $124 $124 $124
Stacking Effect End-Use HVAC
Table 2-13 Typical Savings Estimates for Retrofit CEE Tier 1, Oregon
HVAC Unit w/ HVAC Unit w/Gas HVAC Unit
HP Baseline Baseline w/ Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 26 kWh 26 kWh 26 kWh
Average Unit Energy Savings (Heating) 60 kWh 0 kWh 856 kWh
Average Unit Energy Savings (Combined) 86 kWh 26 kWh 882 kWh
Average Unit Peak Demand Savings (Cooling) 0 W 61 W 61 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost $980 $980 $980
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Air-Source Heat Pumps 21

Table 2-14 Typical Savings Estimates for Retrofit CEE Tier 2, Oregon
HVAC Unit w/ HVAC Unit w/Gas HVAC Unit
HP Baseline Baseline w/ Elec Res
Baseline
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 40 kWh 40 kWh 40 kWh
Average Unit Energy Savings (Heating) 72 kWh 0 kWh 868 kWh
Average Unit Energy Savings (Combined) 112 kWh 40 kWh 908 kWh
Average Unit Peak Demand Savings (Cooling) 96 W 96 W 96 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost $1032 $1032 $1032
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
2.2.1. Definition of Eligible Equipment
All air source systems under 5 tons cooling capacity are eligible provided the installed equipment
meets or exceeds 2019 Consortium for Energy Efficiency (CEE) Tier 1 or Tier 2 efficiencies. Note
that projects replacing pre-existing A/C only units with heat-pump units are eligible under this
measure. In such project the heating component must use a new construction baseline whereas
the cooling component can use either (retrofit or new construction) baselines as deemed
appropriate. Eligibility is determined by calculating the EER, SEER, and/or HSPF as appropriate
for the installed unit.
2.2.2. Definition of Baseline Equipment
Baseline equipment for this measure is determined by the nature of the project. There are two
possible scenarios: retrofit (early replacement) or New construction.
Retrofit (Early Replacement)
If the project is retrofitting pre-existing equipment in working condition, then the baseline efficiency
is defined by the pre-existing equipment. If the equipment being replaced is not in working order,
then this is considered "replace on burn-out" and the baseline becomes new construction.
New Construction (Includes Major Remodel & Replace on Burn-Out)
For New Construction, the baseline efficiency is defined as the minimum allowable EER by the
prevailing building energy code or standard according to which the project was permitted. Current
applicable standards are defined by ASHRAE 90.1-2019. Recently Idaho adopted IECC 2018 as
the energy efficiency standard for new construction.
2.2.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
Air-Source Heat Pumps 22

OkWh = OkWhcoot + OkWhHeat
= Cap * (1/SEERbase,cool— 1/SEERInstalled,cool) / 1000 * EFLHcoot* DF +
Cap * (1/HSPFbase,Heat— 1/HSPFinstalled,Heat) / 1000 * EFLHHeat*DF
OkWpeak = Cap * (1/EERbase,cool— 1/EERinstalled,cool) / 1000 * CIF
2.2.4. Definitions
OkWh Expected energy savings between baseline and installed equipment.
OkWpeak Expected peak demand savings.
EFLH Equivalent full load cooling/heating hours of Idaho specific EFLH are by weather zone
and building in Table 2-15.
CF Peak coincidence factor. Represents the % of the connected load reduction which
occurs during Idaho Power's peak period. Table 2-16
EER Energy Efficiency Ratio for base and installed systems in cooling and heating modes.
This is defined as the ratio of the cooling capacity of the air conditioner in British
Thermal Units per hour, to the total electrical input in watts. Since ASHRAE does not
provide EER requirements for air-cooled air conditioners < 65,000 Btu/h, assume the
following conversion:
EER = -0.02 *SEER2 + 1.12 *SEER
SEER Seasonal Energy efficiency ratio of the air conditioning unit. This is defined as the
ratio of the Annual cooling provided by the air conditioner (in BTU/hr), to the total
electrical input (in Watts). Note that the IEER is an appropriate equivalent. If the
SEER or IEER are unknown or unavailable use the following formula to estimate from
the EER: 11
SEER = .0507 * EER2 + .5773 * EER + .4919
HSPF Heating Season Performance Factor. This is identical to the SEER (described above)
as applied to Heat Pumps in heating mode. If only the heat pump COP is available,
then use the following:
HSPF = .5651 * COP2 + .464 * COP + .4873
Cap Nominal cooling capaity in kBTU/Hr (1 ton = 12,000BTU/Hr)
10 Note that this formula is an approximation and should only be applied to EER values up to 15 EER.
Air-Source Heat Pumps 23

DF Discount factor for reduced savings pertaining to high efficiency HVAC units based
on actual energy saving studies. (Default 0.55)
2.2.5. Sources
■ ENERGYSTAR Heat Pump Requirements and list of qualified products
■ New York Standard Approach for Estimating Energy Savings from Energy Efficiency
Programs— Residential, Multi-Family, and Commercial/Industrial Measures, Version 9
■ California DEER Effective Useful Life worksheets: EUL_Summary_10-1-08. California
DEER Incremental Cost worksheets: Revised DEER Measure Cost Summary
(05_30_2008) Revised (06_02_2008).xls
■ I ECC 2018
■ Consortium for Energy Efficiency, High Efficiency Commercial Air Conditioning and Heat
Pumps Initiative 2019
2.2.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Table 2-15 Stipulated Equivalent Full Load Hours (EFLH) by Building Type"
Zone 5 Zone 6 Oregon
Building Type EFLH EFLH EFLH EFLH EFLH EFLH
Cooling Heating Cooling Heating Cooling Heating
Low Rise 488 622 394 903 287 929
High Rise 910 298 842 498 764 516
Table 2-16 HVAC Coincidence Factors by Building Type
Building Type Coincidence Factor
Low Rise 0.69
High Rise 0.69
" Idaho specific heating and cooling equivalent full load hours were calculated by weather normalizing data from the New York State
TRM for multifamily EFLH values.
Air-Source Heat Pumps 24

2.3. PTAC and PTHP
The following algorithms and assumptions are applicable to energy efficient PTAC and PTHP
units installed in multifamily units. This measure applies to projects which represent either
equipment retrofit or new construction (including major renovations).
Table 2-17 through Table 2-22 summarizes the `typical' expected (per ton) unit energy impacts
for this measure.12 Typical values are based on algorithms and stipulated values described below
and data from past program participants. Savings are shown as a unit that is 10% better than the
stated baseline and 20% better than code. Note: the 20% better than code column should be
added to the 10% better than code for eligible units.
Typical Savings are split into two regions, Idaho and Oregon. Table 2-17 through Table 2-19 refer
to Idaho and Table 2-20 through Table 2-22 refer to Oregon.
Table 2-17 Typical Savings Estimates for New Construction High Efficiency, PTHP with
Different Baseline Units, Idaho
PTHP +10% PTHP +10% PTHP +10% PTHP
wl HP w/Gas w/ Elec Res +20%w/
Baseline Baseline Baseline +10%
Baseline
Deemed Savings Unit Tons Tons Tons Tons
Average Unit Energy Savings (Cooling) 39 kWh 39 kWh 39 kWh 32 kWh
Average Unit Energy Savings (Heating) 48 kWh 0 kWh 612 kWh 34 kWh
Average Unit Energy Savings 87 kWh 39 kWh 651 kWh 66 kWh
(Combined)
Average Unit Peak Demand Savings 71 W 71 W 71 W 60 W
(Cooling)
Expected Useful Life 15 Years 15 Years 15 Years 15 Years
Average Material & Labor Cost NA Na NA NA
Average Incremental Cost $224 $384 $384 $224
Stacking Effect End-Use HVAC
12 See spreadsheet"3-TypicalCalcs_Packaged_MF_vl.xlsx"for assumptions and calculations used to estimate the typical unit energy
savings and incremental costs.
PTAC and PTHP 25

Table 2-18 Typical Savings Estimates for Retrofit High Efficiency, PTHP with Different Baseline
Units, Idaho
PTHP +10% PTHP +10% PTHP +10% PTHP +20%
w/ HP w/ Gas w/ Elec Res w/+10%
Baseline Baseline Baseline Baseline
Deemed Savings Unit Tons Tons Tons Tons
Average Unit Energy Savings (Cooling) 86 kWh 86 kWh 86 kWh 32 kWh
Average Unit Energy Savings (Heating) 95 kWh 0 kWh 722 kWh 34 kWh
Average Unit Energy Savings (Combined) 181 kWh 86 kWh 808 kWh 66 kWh
Average Unit Peak Demand Savings (Cooling) 159 W 159 W 159 W 60 W
Expected Useful Life 15 Years 15 Years 15 Years 15 Years
Average Material & Labor Cost $1783 $1783 $1783 $2006
Average Incremental Cost NA NA NA NA
Stacking Effect End-Use HVAC
Table 2-19 Typical Savings Estimates for High Efficiency, PTAC, Idaho
New Construction Retrofit PTAC +20%
+10%
PTAC +10% PTAC +10% w/w/+10%
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 39 kWh 86 kWh 32 kWh
Average Unit Energy Savings (Heating) 0 kWh 0 kWh 0 kWh
Average Unit Energy Savings (Combined) 39 kWh 86 kWh 32 kWh
Average Unit Peak Demand Savings 71 W 159 W 60 W
(Cooling)
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA $1599 $1800
Average Incremental Cost $201 NA $201
Stacking Effect End-Use HVAC
3 This column can be used to add to New Construction or Retrofit.
PTAC and PTHP 26

Table 2-20 Typical Savings Estimates for New Construction High Efficiency, PTHP with
Different Baseline Units, Oregon
PTHP +10% PTHP +10% PTHP +10% PTHP +20%
w/ HP w/Gas w/ Elec Res w/+10%
Baseline Baseline Baseline Baseline
Deemed Savings Unit Tons Tons Tons Tons
Average Unit Energy Savings (Cooling) 30 kWh 30 kWh 30 kWh 25 kWh
Average Unit Energy Savings (Heating) 68 kWh 0 kWh 870 kWh 48 kWh
Average Unit Energy Savings (Combined) 98 kWh 30 kWh 900 kWh 73 kWh
Average Unit Peak Demand Savings (Cooling) 71 W 71 W 71 W 60 W
Expected Useful Life 15 Years 15 Years 15 Years 15 Years
Average Material & Labor Cost NA Na NA NA
Average Incremental Cost $224 $384 $384 $224
Stacking Effect End-Use HVAC
Table 2-21 Typical Savings Estimates for Retrofit High Efficiency, PTHP with Different Baseline
Units, Oregon
PTHP +10% PTHP +10% PTHP +10% PTHP +20%
w/ HP w/Gas w/ Elec Res w/+10%
Baseline Baseline Baseline Baseline
Deemed Savings Unit Tons Tons Tons Tons
Average Unit Energy Savings (Cooling) 67 kWh 67 kWh 67 kWh 25 kWh
Average Unit Energy Savings (Heating) 134 kWh 0 kWh 1,025 kWh 48 kWh
Average Unit Energy Savings (Combined) 201 kWh 67 kWh 1,092 kWh 73 kWh
Average Unit Peak Demand Savings (Cooling) 159 W 159 W 159 W 60 W
Expected Useful Life 15 Years 15 Years 15 Years 15 Years
Average Material & Labor Cost $1783 $1783 $1783 $2006
Average Incremental Cost NA NA NA NA
Stacking Effect End-Use HVAC
PTAC and PTHP 27

Table 2-22 Typical Savings Estimates for High Efficiency, PTAC, Oregon
New Construction Retrofit PTAC +20%
w/+10%
PTAC +10% PTAC +10% _ baseline14
Deemed Savings Unit Tons Tons Tons
Average Unit Energy Savings (Cooling) 30 kWh 67 kWh 25 kWh
Average Unit Energy Savings (Heating) 0 kWh 0 kWh 0 kWh
Average Unit Energy Savings (Combined) 30 kWh 67 kWh 25 kWh
Average Unit Peak Demand Savings (Cooling) 71 W 159 W 60 W
Expected Useful Life 15 Years 15 Years 15 Years
Average Material & Labor Cost NA $1599 $1800
Average Incremental Cost $201 NA $201
Stacking Effect End-Use HVAC
2.3.1. Definition of Eligible Equipment
All commercial PTHP and PTAC units under 5 tons are eligible provided the installed equipment
exceeds IECC 2018 minimum standard equipment efficiency by at least 10%.
2.3.2. Definition of Baseline Equipment
Baseline equipment for this measure is determined by the nature of the project. There are two
possible scenarios: retrofit (early replacement) or new construction.
Retrofit (Early Replacement)
If the project is retrofitting pre-existing equipment in working condition, then the baseline efficiency
is defined by the pre-existing equipment. If the equipment being replaced is not in working order,
then this is considered "replace on burn-out" and the baseline becomes new construction. Note
that units replacing window/wall mounted air-conditioners, room air-conditioners, and/or
evaporative cooling are not eligible for early replacement and are considered "New Construction."
New Construction (Includes Major Remodel & Replace on Burn-Out)
For New Construction, the baseline efficiency is defined as the minimum allowable SEER and
EER by the prevailing building energy code or standard according to which the project was
permitted. Recently Idaho adopted IECC 2018 as the energy efficiency standard for new
construction.
2.3.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
14 This column can be used to add to New Construction or Retrofit.
PTAC and PTHP 28

OkWh = OkWhcoot + OkWhHeat
= Cap * (1/SEERbase,cool— 1/SEERInstalled,cool) / 1000 * EFLHcoot* DF+
Cap * (1/HSPFbase,Heat— 1/HSPFinstalled,Heat) / 1000 * EFLHHeat*DF
OkWpeak = Cap * (1/EERbase,cool— 1/EERinstalled,cool) / 1000 * CIF
2.3.4. Definitions
OkWh Expected energy savings between baseline and installed equipment.
OkWpeak Expected peak demand savings.
EFLH Equivalent full load cooling/heating hours of Idaho specific EFLH are by weather zone
and building in Table 2-23.
CF Peak coincidence factor. Represents the % of the connected load reduction which
occurs during Idaho Power's peak period. Table 2-24
EER Energy Efficiency Ratio for base and installed systems. This is defined as the ratio of
the cooling capacity of the air conditioner in British Thermal Units per hour, to the
total electrical input in watts. Since ASHRAE does not provide EER requirements for
air-cooled air conditioners < 65,000 Btu/h, assume the following conversion:
EER = -0.02 *SEER2 + 1.12 *SEER
SEER Seasonal Energy efficiency ratio of the air conditioning unit. This is defined as the
ratio of the Annual cooling provided by the air conditioner (in BTU/hr), to the total
electrical input (in Watts). Note that the IEER is an appropriate equivalent. If the
SEER or IEER are unknown or unavailable use the following formula to estimate from
the EER: 15
SEER = .0507 * EER2 + .5773 * EER + .4919
HSPF Heating Season Performance Factor. This is identical to the SEER(described above)
as applied to Heat Pumps in heating mode. If only the heat pump COP is available,
then use the following:
HSPF = .5651 * COP2 + .464 * COP + .4873
Cap Nominal cooling capaity in kBTU/Hr (1 ton = 12,000BTU/Hr)
DF Discount factor for reduced savings pertaining to high efficiency HVAC units based
on actual energy saving studies. (Default 0.55)
15 Note that this formula is an approximation and should only be applied to EER values up to 15 EER.
PTAC and PTHP 29

2.3.5. Sources
■ New York Standard Approach for Estimating Energy Savings from Energy Efficiency
Programs — Residential, Multi-Family, and Commercial/Industrial Measures, Version 9
■ ASHRAE, Standard 90.1-2019.
■ California DEER Effective Useful Life worksheets: EUL_Summary_10-1-08. California
DEER Incremental Cost worksheets: Revised DEER Measure Cost Summary
(05_30_2008) Revised (06_02_2008).xls
■ I ECC 2018
2.3.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Table 2-23 Stipulated Equivalent Full Load Cooling and Heating Hours (EFLH) by Building
Type16
Zone 5 _ Zone 6 Oregon
Building Type EFLH EFLH EFLH EFLH EFLH EFLH
Cooling _Heating Cooling Heating_ Cooling Heating
Low Rise 488 622 394 903 287 929
High Rise 910 298 842 498 764 516
Table 2-24 HVAC Coincidence Factors by Building Type
Building Type Coincidence Factor
Low Rise 0.69
High Rise 0.69
6 Idaho specific heating and cooling equivalent full load hours were calculated by weather normalizing data from the New York State
TRM for multifamily EFLH values.
PTAC and PTHP 30

2.4. Ventilating Bathroom Exhaust Fan
Ventilating bath exhaust fans in multifamily buildings are installed to exhaust either hot and humid
air caused by a resident taking a shower in the space, or foul smelling air. A bathroom exhaust
fan can be installed in two different systems. The first system is in a residential bathroom which
is manually controlled to turn on when the space is in use. This will exhaust air as needed based
on the occupant. The second system is designed to function as part of the building's HVAC system
and operate continuously.
Table 2-25 through Table 2-28 summarizes the `typical' expected energy impacts for this
measure. Typical values are based on the algorithms and stipulated values described below".
Table 2-25 Typical Saving Estimate for New Construction Manual Exhaust Fan
ESME Fan without Light ESME Fan with Light
Deemed Savings Unit Unit Unit
Average Unit Energy Savings 126 kWh 169 kWh
Average Unit Peak Demand Savings 0.13 kW 0.18 kW
Expected Useful Life 19 years 19 years
Average Material & Labor Cost NA NA
Average Incremental Cost $17 $95
Stacking Effect End-Use NA
Table 2-26 Typical Saving Estimate for Retrofit Manual Exhaust Fan
ESME Fan without Light ESME Fan with Light
Deemed Savings Unit Unit Unit
Average Unit Energy Savings 139 kWh 188 kWh
Average Unit Peak Demand Savings 0.15 kW 0.20 kW
Expected Useful Life 19 years 19 years
Average Material & Labor Cost $82 $177
Average Incremental Cost NA NA
Stacking Effect End-Use NA
"See spreadsheet"4-TypicalCalcs_Bath Fan_MF_vl.xlsx"for assumptions and calculations used to estimate the typical unit energy
savings and incremental costs.
Ventilating Bathroom Exhaust Fan 31

Table 2-27 Typical Saving Estimate for New Construction Continuous Exhaust Fan
Single Speed 2-speed <90 2-speed >90
Deemed Savings Unit Unit Unit Unit
Average Unit Energy Savings 113 kWh 120 kWh 120 kWh
Average Unit Peak Demand Savings 0.01 kW 0.01 kW 0.01 kW
Expected Useful Life 19 years 19 years 19 years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $46 $58 $56
Stacking Effect End-Use NA
Table 2-28 Typical Saving Estimate for Retrofit Continuous Exhaust Fan
Single Speed 2-speed <90 2-speed >90
Deemed Savings Unit Unit Unit Unit
Average Unit Energy Savings 128 kWh 137 kWh 137 kWh
Average Unit Peak Demand Savings 0.01 kW 0.02 kW 0.02 kW
Expected Useful Life 19 years 19 years 19 years
Average Material & Labor Cost $86 $205 $168
Average Incremental Cost NA NA NA
Stacking Effect End-Use NA
2.4.1. Definition of Eligible Equipment
Eligible equipment are bath fans that meet or exceed ENERGY STAR minimum energy
requirements. For continuously operated exhaust fans, eligible equipment is broken up based on
the number and cfm of the unit.
For manually operated exhaust fans, eligible equipment must meet ENERGY STAR's Most
Efficient (ESME) certified requirements. Eligible equipment is broken up based on if the exhaust
fan has a light and heater included.
2.4.2. Definition of Baseline Equipment
There are two possible project baseline scenarios — retrofit and new construction.
Retrofit (Early Replacement)
The baseline equipment for retrofit are standard exhaust fans that do not meet ENERGY STAR's
requirements.
New Construction (Includes Major Remodel & Replace on Burn-Out)
The baseline equipment for new construction are standard exhaust fans that do not meet
ENERGY STAR's requirements.
Ventilating Bathroom Exhaust Fan 32

2.4.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
Manual Exhaust Fans:
kWhsavings = kWhbase — kWhmeasure
365
kWhi = (Wfan X Hrsfan + Wheat X HrSheat ) X
(-1,000)
Continuous Exhaust Fans:
kWhsavings = kWhbase — kWhmeasure
kWhi = (E f fHs x CFMHS x HrSHS + E f fLs x CFMLs x HrSLS) x ( 365 )
1,000
2.4.4. Definitions
kWhsavings Expected annual energy savings between baseline and installed equipment.
kWhi Expected daily energy consumption of bathroom exhaust fan
W Operating wattage of the system component
Hrs Daily estimated operating hours
HSIS Fan operating condition, High Speed or Low Speed
Eff Fan operating efficiency, cfm/W
CFM Operating airflow, cfm
2.4.5. Sources
■ Energy Trust of Oregon Measure Approval Document for Multifamily Bath Fans
■ Energy Trust of Oregon Measure Approval Document for Ventilating Bath Exhaust Fans
in New Multifamily Buildings
Ventilating Bathroom Exhaust Fan 33

2.4.6. Stipulated Values
Table 2-29 Continuous Exhaust Fan Deemed Variables
High Low
High High Speed LOW Low Speed
Speed Speed Daily Speed Speed Daily
Efficacy CFM Operating Efficacy CFM Operating
(CFM/W) Hours (CFM/W) _ Hours
Baseline Single Speed 2.8 50 24 0.0 0 0.0
Baseline 2-speed <90 2.8 80 2.6 2.8 50 21.4
Baseline 2-speed >90 3.5 110 2.6 2.8 50 21.4
Measure Single Speed 10.0 50 24.0 10.0 0 0.0
Measure 2-speed <90 10.0 80 2.6 10.0 50 21.4
Measure 2-speed >90 10.0 110 2.6 10.0 50 21.4
Table 2-30 Continuous Exhaust Fan Deemed Variables
Fan Light/heater Daily Fan Daily
Wattage Wattage Hours of light/heater
(W) (W) Use (hrs) hours use (hrs)
Baseline ESME Fan without Light 140.5 0.0 2.6 0.0
Baseline ESME Fan with Light 51.9 312.0 2.6 1.2
Measure ESME Fan without Light 8.2 0.0 2.6 0.0
Measure ESME Fan with Light 12.5 11.5 2.6 1.2
Ventilating Bathroom Exhaust Fan 34

2.5. Spa Covers
A typical spa will use up to 2,500 kWh per year to maintain the desired temperature.This is caused
by heat loss through all sides of the spa. A typical above ground spa will come with a standard
cover to help insulate the water from the outside conditions. This measure consists of using a
high insulation spa cover to reduce the amount of heat loss.
Table 2-31 and Table 2-32 summarizes the `typical' expected energy impacts for this measure.
Typical values are based on the algorithms and stipulated values described below'$.
Table 2-31 Typical Saving Estimate for Efficient Spa Covers, Idaho
New Construction Cover Retrofit Cover
Deemed Savings Unit Unit Unit
Average Unit Energy Savings 196 kWh 196 kWh
Average Unit Peak Demand Savings 0.02 kW 0.02 kW
Expected Useful Life 7 years 7 years
Average Material & Labor Cost NA $100
Average Incremental Cost $100 NA
Stacking Effect End-Use NA
Table 2-32 Typical Saving Estimate for Efficient Spa Covers, Oregon
New Construction Cover Retrofit Cover
Deemed Savings Unit Unit Unit
Average Unit Energy Savings 216 kWh 216 kWh
Average Unit Peak Demand Savings 0.02 kW 0.02 kW
Expected Useful Life 7 years 7 years
Average Material & Labor Cost NA $100
Average Incremental Cost $100 NA
Stacking Effect End-Use NA
2.5.1. Definition of Eligible Equipment
Eligible spa covers must have a minimum R-value of 12 and be continuous with no hinges. Spa
cover measure only applies to electrically heated spa units. Spa covers must have an area greater
than 25 square feet and less than 77 square feet.
2.5.2. Definition of Baseline Equipment
There are two possible project baseline scenarios — retrofit and new construction.
18 See spreadsheet"5-TypicalCalcs_SpaCover_MF_vl.xlsx"for assumptions and calculations used to estimate the typical unit energy
savings and incremental costs.
Spa Covers 35

Retrofit (Early Replacement)
The baseline equipment for retrofit covers are a standard spa cover with an average insulation
value between 8 and 15.
New Construction (Includes Major Remodel & Replace on Burn-Out)
The baseline equipment for new construction are a standard spa cover with an average insulation
value between 8 and 15.
2.5.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
kWhsavings = kWhbase - kWhmeasure
UXAxAT
kWhi =
3,412
2.5.4. Definitions
kWhsavings Expected annual energy savings between baseline and installed equipment.
kWhi Expected annual energy consumption of the spa
U Cover insulation U-value
A Cover insulation area, square feet
AT Annual summation of temperature difference between the spa and outside air
temperature
3,412 Conversion factor
2.5.5. Sources
■ Energy Trust of Oregon Measure Approval Document for Efficient Spa Covers
Spa Covers 36

2.5.6. Stipulated Values
Table 2-33 Standard Spa Cover Deemed Variables
Baseline Cover Measure Cover
Insulation (U- Insulation (U- Cover Area (sf)
value) value)
0.096 0.067 51
Table 2-34 Annual Summation of Hour Temperature Difference by Weather Zone
Zone 5 Zone 6 Oregon
436,642 480,956 489,216
Spa Covers 37

2.6. Pool Covers
A typical heated pool will lose energy through Convection, Evaporation, Radiation and
Conduction. A majority of the heat loss is caused by evaporation, so adding a pool cover that
stops water evaporation will help save energy when the pool is not in use. This measure consists
of installing a solid pool cover to prevent evaporation when the heated pool is not occupied.
Table 2-35 and Table 2-37 summarizes the `typical' expected energy impacts for this measure.
Typical values are based on the algorithms and stipulated values described below19.
Table 2-35 Typical Saving Estimate for Outdoor Pool Covers, Idaho
Electric Resistance Heater Heat Pump Heater
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 104 kWh 21 kWh
Average Unit Peak Demand Savings 0.00 kW 0.00 kW
Expected Useful Life 10 years 10 years
Average Material & Labor Cost $4.99 $4.99
Average Incremental Cost $4.99 $4.99
Stacking Effect End-Use NA
Table 2-36 Typical Saving Estimate for Outdoor Pool Covers, Oregon
_ Electric Resistance Heater Heat Pump Heater
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 77 kWh 15 kWh
Average Unit Peak Demand Savings 0.00 kW 0.00 kW
Expected Useful Life 10 years 10 years
Average Material & Labor Cost $4.99 $4.99
Average Incremental Cost $4.99 $4.99
Stacking Effect End-Use NA
19 See spreadsheet"6-TypicalCalcs_PoolCover_MF_vl.xlsx"for assumptions and calculations used to estimate the typical unit energy
savings and incremental costs.
Pool Covers 38

Table 2-37 Typical Saving Estimate for Indoor Pool Covers
Electric Resistance Heater Heat Pump Heater
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 39 kWh 8 kWh
Average Unit Peak Demand Savings 0.00 kW 0.00 kW
Expected Useful Life 10 years 10 years
Average Material & Labor Cost $4.99 $4.99
Average Incremental Cost $4.99 $4.99
Stacking Effect End-Use NA
2.6.1. Definition of Eligible Equipment
Eligible pool covers must be installed on a heated pool without a cover and must be installed
during time periods when the pool is not open. Pool covers must be a solid track, bubble or foam
cover. Oher pool covers such as liquid evaporation suppressants, solar disks, and mesh covers
do not qualify.
2.6.2. Definition of Baseline Equipment
There are two possible project baseline scenarios — retrofit and new construction.
Retrofit (Early Replacement)
The baseline equipment for retrofit is an uncovered pool.
New Construction (Includes Major Remodel & Replace on Burn-Out)
The baseline equipment for new construction is an uncovered pool.
2.6.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
kWhsavings — kW hper area X A
2.6.4. Definitions
kWhsavings Expected annual energy savings
kWhper areaDeemed savings per pool location and heating type
A Cover area, square feet
2.6.5. Sources
L Energy Trust of Oregon Measure Approval Document for Pool Covers
Pool Covers 39

2.6.6. Stipulated Values
Table 2-38 Deemed Savings for Outdoor Pool Covers by Zone and Heater Type
Electric Resistance Heat Pump
Zone 5 107.3 21.5
Zone 6 93.0 18.7
Oregon 76.8 15.4
Indoor 38.8 7.8
Pool Covers 40

2.7. Efficient Windows
The following algorithm and assumptions are applicable to efficient windows in multifamily spaces
which provide a lower U-value than existing windows or prevailing codes and standards. Savings
will be realized through reductions in the buildings cooling and heating loads. Note that window
films and windows with too low an SHGC value can for many buildings increase the heating loads
(unless the building has a significant internal load as is the case for example in hospitals and/or
data centers). In a heating dominated climate such as Idaho the increase in heating loads can
negate any reduction in the cooling loads. Energy impacts for this measure are largely due to the
improved U-Value and care should be taken when selecting windows to ensure that the SHGC
values are appropriate for the building and climate. This measure only applies to low-rise
multifamily buildings.
Table 2-39 through Table 2-42 summarize the `typical' expected (per window ft2) energy impacts
for this measure. Typical values are based on the algorithms and stipulated values described
below.20
Typical Savings are split into two regions, Idaho and Oregon. Table 2-39 and Table 2-40 refer to
Idaho, and Table 2-41 and Table 2-42 refer to Oregon.
Table 2-39 Typical Savings Estimates for Efficient Windows with Electric Resistance Heating,
Idaho
Tier 1 Savings Tier 2 Savings Tier 3 Savings
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 2.46 kWh 5.17 kWh 8.89 kWh
Average Unit Peak Demand Savings 0 kW 0 kW 0 kW
Expected Useful Life 45 years 45 years 45 years
Average Material & Labor Cost $0.71 $1.5 $2.57
Average Incremental Cost $0.71 $1.5 $2.57
Stacking Effect End-Use HVAC
21 See spreadsheet"7-TypicalCalcs_Window_v1.xlsx"for additional assumptions and calculations, EUL,and incremental cost.
Efficient Windows 41

Table 2-40 Typical Savings Estimates for Efficient Windows with Heat Pump Heating, Idaho
Tier 1 Savings Tier 2 Savings Tier 3 Savings
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.15 kWh 0.29 kWh 0.51 kWh
Average Unit Peak Demand Savings 0 kW 0 kW 0 kW
Expected Useful Life 45 years 45 years 45 years
Average Material & Labor Cost $0.71 $1.5 $2.57
Average Incremental Cost $0.71 $1.5 $2.57
Stacking Effect End-Use HVAC
Table 2-41 Typical Savings Estimates for Efficient Windows with Electric Resistance Heating,
Oregon
Tier 1 Savings Tier 2 Savings Tier 3 Savings
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 3.06 kWh 6.44 kWh 11.08 kWh
Average Unit Peak Demand Savings 0 kW 0 kW 0 kW
Expected Useful Life 45 years 45 years 45 years
Average Material & Labor Cost $0.71 $1.5 $2.57
Average Incremental Cost $0.71 $1.5 $2.57
Stacking Effect End-Use HVAC
Table 2-42 Typical Savings Estimates for Efficient Windows with Heat Pump Heating, Oregon
Tier 1 Savings Tier 2 Savings Tier 3 Savings
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.18 kWh 0.37 kWh 0.63 kWh
Average Unit Peak Demand Savings 0 kW 0 kW 0 kW
Expected Useful Life 45 years 45 years 45 years
Average Material & Labor Cost $0.71 $1.5 $2.57
Average Incremental Cost $0.71 $1.5 $2.57
Stacking Effect End-Use HVAC
2.7.1. Definition of Eligible Equipment
To be considered eligible equipment windows must be independently tested and certified
according to the standards established by the National Fenestration Rating Council (NFRC).
While the NFRC does provide such testing and certification - any NFRC-licensed independent
certification and inspection agency can provide certification. One example of such a body is the
American Architectural Manufacturers Association (AAMA). In addition, eligible windows must
meet or exceed the following performance ratings:
Efficient Windows 42

Tier 1: SHGC = any and U-factor <=0.3
Tier 2: SHGC = any and U-factor <= 0.27
Tier 3: SHGC = any and U-factor <= 0.24
Window films and shades are not eligible under this measure as they reduce the SHGC without
providing an appreciable improvement in the U-Value and in many circumstances their addition
would result in an increased heating load which negates or exceeds the reduction in cooling loads.
Retrofit equipment replacement must include replacing the glass and window frame together.
2.7.2. Definition of Baseline Equipment
Baseline equipment for this measure is determined by the nature of the project. There are two
possible scenarios: retrofit (early replacement) or new construction.
Retrofit (Early Replacement)
If the project is retrofitting pre-existing equipment, then the baseline efficiency is defined by the
pre-existing windows.
New Construction (Includes Major Remodel & Replace on Burn-Out)
For new construction, the baseline efficiency is defined as the minimum allowable window
performance in the prevailing building energy code or standard to which the project was permitted.
Recently Idaho adopted IECC 2018 and ASHRAE 90.1 2019 as the energy efficiency standard
for new construction.
2.7.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
kWhsavings = kWhper area X A
2.7.4. Definitions
kWhsavings Expected annual energy savings
kWhper area Deemed savings per square foot
A Cover area, square feet
2.7.5. Sources
Energy Trust of Oregon Measure Approval Document for Residential Windows
Efficient Windows 43

2.7.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Table 2-43 Window Tier Efficiency Requirements
U-Value SHGC
Tier 1 0.3 - 0.28 Any
Tier 2 0.27—0.25 Any
Tier 3 <=0.24 Any
Table 2-44 Deemed Savings per Sq. Ft.
Tier Heating Type kWh/sf
1 Elec Res 1.84
HP 0.11
Elec Res 3.87
2
HP 0.22
Elec Res 6.66
3
HP 0.38
Efficient Windows 44

2.8. Ceiling Insulation
The following algorithms and assumptions are applicable to ceiling insulation installed in
multifamily spaces which are more efficient than existing insulation or prevailing codes and
standards.
Ceiling insulation is rated by its R-value. An R-value indicates its resistance to heat flow (where
a higher the R-value indicates a greater insulating effectiveness). The R-value depends on the
type of insulation including its material, thickness, and density. When calculating the R-value of a
multilayered installation, add the R-values of the individual layers.
Table 2-45 and Table 2-52 summarizes the `typical' expected (per insulation ft2 square foot)
energy impacts for this measure.21
Typical Savings are split into two regions, Idaho and Oregon. For Retrofit, Table 2-45 and Table
2-46 refer to Idaho, and Table 2-47 and Table 2-48 refer to Oregon. For New Construction, Table
2-49 and Table 2-50 refer to Idaho, and Table 2-51 and Table 2-52 refer to Oregon.
Table 2-45 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Idaho
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.10 kWh 0.15 kWh 0.18 kWh
Average Unit Peak Demand Savings 0.002 W 0.003 W 0.004 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $1.57 $1.87
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-46 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Idaho
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.21 kWh 0.31 kWh 0.38 kWh
Average Unit Peak Demand Savings 0.002 W 0.003 W 0.004 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $1.57 $1.87
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
21 See spreadsheet "8-TypicalCalcs_Ceilinglnsulation_vl.xlsx" for assumptions and calculations used to estimate the typical unit
energy savings and incremental costs for cooling savings.
Ceiling Insulation 45

Table 2-47 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Oregon
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.13 kWh 0.18 kWh 0.23 kWh
Average Unit Peak Demand Savings 0.001 W 0.002 W 0.003 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $1.57 $1.87
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-48 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Oregon
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.27 kWh 0.39 kWh 0.47 kWh
Average Unit Peak Demand Savings 0.001 W 0.002 W 0.003 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $1.57 $1.87
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-49 Typical Savings Estimates for New Construction Heat Pump Heated Spaces, Idaho
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.06 kWh 0.08 kWh 0.11 kWh
Average Unit Peak Demand Savings 0.001 W 0.002 W 0.002 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $0.81 $0.35 $0.65
Stacking Effect End-Use HVAC
Ceiling Insulation 46

Table 2-50 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Idaho
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.13 kWh 0.16 kWh 0.23 kWh
Average Unit Peak Demand Savings 0.001 W 0.002 W 0.002 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $0.81 $0.35 $0.65
Stacking Effect End-Use HVAC
Table 2-51 Typical Savings Estimates for New Construction Heat Pump Heated Spaces,
Oregon
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.08 kWh 0.10 kWh 0.14 kWh
Average Unit Peak Demand Savings 0.001 W 0.001 W 0.002 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $0.81 $0.35 $0.65
Stacking Effect End-Use HVAC
Table 2-52 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Oregon
Adding Rigid Upgrading to Upgrading to
Insulation R-38 R-49
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.17 kWh 0.20 kWh 0.29 kWh
Average Unit Peak Demand Savings 0.001 W 0.001 W 0.002 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost NA NA NA
Average Incremental Cost $0.81 $0.35 $0.65
Stacking Effect End-Use HVAC
2.8.1. Definition of Eligible Equipment
Eligible roof/ceiling area is limited to buildings or potions of buildings with central mechanical air
conditioning or PTAC systems. Qualifying ceiling insulation can be rigid foam, fiberglass bat, or
Ceiling Insulation 47

blown-in fiberglass or cellulose a long as material is eligible, assuming it meets or exceeds the
required R-value. The insulation must upgrade from R19 or less. Added rigid insulation must
provide continuous insulation with an R-value of 10 minimum. Additional insulation measures
include installing R-38 and R-49.
2.8.2. Definition of Baseline Equipment
Baseline equipment for this measure is determined by the nature of the project. There are two
possible scenarios: retrofit (early replacement) or new construction.
Retrofit (Early Replacement)
If the project is retrofitting pre-existing insulation, then the baseline efficiency is defined by the
pre-existing insulation.
New Construction (New Construction, Replace on Burnout)
New Construction must meet building code and will only be eligible for added insulation above
building code. The baseline ceiling insulation for new construction is estimated at R-25 continuous
insulation.
2.8.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
AkWh = AkWhcoo, + AkWhheat
AkWhcoo, = A* (CDD * 24)/(SEER * 3412) * (1/Rbase— 1/Rmeas)
AkWhheat = A* (HDD * 24)/(HSPF * 3412) * (1/Rbase— 1/Rmeas)
AkWpeak = AkWhcool / EFLHcool * CF
2.8.4. Definitions
A Area of the insulation that was installed in square feet
HDD Heating degree days, refer to Table 2-54 for typical heating degree days
for different buildings. When possible, actual base temperatures should
be used to calculate the HDD
CDD Cooling degree days refer to Table 2-54 for typical cooling degree days
for different buildings. When possible, actual base temperatures should
be used to calculate the CDD.
Rbase The R-value of the insulation and support structure before the additional
insulation is installed
Rmeas The total measure R-value of all insulation after the additional insulation
is installed
Ceiling Insulation 48

EFLH Annual equivalent full load cooling hours for the air conditioning unit.
Values for various building types are stipulated in Table 2-54. When
available, actual system hours of use should be used.
SEER Seasonal Energy efficiency ratio of the air conditioning unit. This is defined
as the ratio of the Annual cooling provided by the air conditioner (in
BTU/hr), to the total electrical input (in Watts). Note that the IEER is an
appropriate equivalent. If the SEER or IEER are unknown or unavailable
use the following formula to estimate from the EER:
SEER22 = .0507 * EER2 + .5773 * EER + .4919
HSPF Heating Season Performance Factor. This is identical to the SEER
(described above) as applied to Heat Pumps in heating mode. If only the
heat pump COP is available, then use the following:
HSPF = .5651 * COP2 + .464 * COP + .4873
CF Peak coincidence factor. Represents the % of the connected load
reduction which occurs during Idaho Power's peak period.
2.8.5. Sources
■ ASHRAE, Standard 90.1-2019.
■ New York Standard Approach for Estimating Energy Savings from Energy Efficiency
Programs — Residential, Multi-Family, and Commercial/Industrial Measures, Version 9
■ California DEER Effective Useful Life worksheets: EUL_Summary_10-1-08.xls
■ I ECC 2018
■ 2019 California Residential Appliance Saturation Study (RASS)
2.8.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Table 2-53 Standard System Variables
CIF SEER HSPF,hp HSPF,elec
0.69 12.6 7.2 3.41
22 Note that this formula is an approximation and should only be applied to EER values up to 15 EER.
Ceiling Insulation 49

Table 2-54 Weather Zone Dependent Variables
EFLH,c EFLH,h CDD HDD
Zone 5 699 460 240 5,297
Zone 6 618 701 165 6,954
Oregon 526 722 107 7,094
Idaho Weighted Average 683 508 225 5,628
Ceiling Insulation 50

2.9. Floor Insulation
The following algorithms and assumptions are applicable to floor insulation installed in multifamily
spaces which are more efficient than existing insulation or prevailing codes and standards.
Floor insulation is rated by its R-value. An R-value indicates its resistance to heat flow (where a
higher the R-value indicates a greater insulating effectiveness). The R-value depends on the type
of insulation including its material, thickness, and density. When calculating the R-value of a
multilayered installation, add the R-values of the individual layers.
Table 2-55 and Table 2-62 summarizes the `typical' expected (per insulation ft2 square foot)
energy impacts for this measure.23
Typical Savings are split into two regions, Idaho and Oregon. For Retrofit, Table 2-55 and Table
2-56 refer to Idaho, and Table 2-57 and Table 2-58 refer to Oregon. For New Construction, Table
2-59 and Table 2-60 refer to Idaho, and Table 2-61 and Table 2-62 refer to Oregon.
Table 2-55 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Idaho
Adding Rigid Upgrading to Upgrading to
Insulation R-13 R-19
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.75 kWh 0.69 kWh 0.83 kWh
Average Unit Peak Demand Savings 0.017 W 0.016 W 0.019 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $0.89 $1.04
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-56 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Idaho
Adding Rigid Upgrading to Upgrading to
Insulation R-13 R-19
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 1.56 kWh 1.44 kWh 1.73 kWh
Average Unit Peak Demand Savings 0.017 W 0.016 W 0.019 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $0.89 $1.04
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
23 See spreadsheet"9-TypicalCalcs_Floorinsulation_vl.xlsx"for assumptions and calculations used to estimate the typical unit energy
savings and incremental costs for cooling savings.
Floor Insulation 51

Table 2-57 Typical Savings Estimates for Retrofit Heat Pump Heated Spaces, Oregon
Adding Rigid Upgrading to Upgrading to
Insulation R-13 R-19
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 0.93 kWh 0.86 kWh 1.03 kWh
Average Unit Peak Demand Savings 0.010 W 0.010 W 0.012 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $0.89 $1.04
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-58 Typical Savings Estimates for Retrofit Electric Resistance Heated Spaces, Oregon
Adding Rigid Upgrading to Upgrading to
Insulation R-13 R-19
Deemed Savings Unit Square Foot Square Foot Square Foot
Average Unit Energy Savings 1.96 kWh 1.81 kWh 2.17 kWh
Average Unit Peak Demand Savings 0.010 W 0.010 W 0.012 W
Expected Useful Life 25 years 25 years 25 years
Average Material & Labor Cost $0.81 $0.89 $1.04
Average Incremental Cost NA NA NA
Stacking Effect End-Use HVAC
Table 2-59 Typical Savings Estimates for New Construction Heat Pump Heated Spaces, Idaho
Adding Rigid Upgrading to
Insulation R-19
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 0.19 kWh 0.14 kWh
Average Unit Peak Demand Savings 0.004 W 0.003 W
Expected Useful Life 25 years 25 years
Average Material & Labor Cost NA NA
Average Incremental Cost $0.81 $0.15
Stacking Effect End-Use HVAC
Floor Insulation 52

Table 2-60 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Idaho
Adding Rigid Upgrading to
Insulation R-19
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 0.39 kWh 0.29 kWh
Average Unit Peak Demand Savings 0.004 W 0.003 W
Expected Useful Life 25 years 25 years
Average Material & Labor Cost NA NA
Average Incremental Cost $0.81 $0.15
Stacking Effect End-Use HVAC
Table 2-61 Typical Savings Estimates for New Construction Heat Pump Heated Spaces,
Oregon
Adding Rigid Upgrading to
Insulation R-19
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 0.23 kWh 0.17 kWh
Average Unit Peak Demand Savings 0.003 W 0.002 W
Expected Useful Life 25 years 25 years
Average Material & Labor Cost NA NA
Average Incremental Cost $0.81 $0.15
Stacking Effect End-Use HVAC
Table 2-62 Typical Savings Estimates for New Construction Electric Resistance Heated Spaces,
Oregon
Adding Rigid Upgrading to
Insulation R-19
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 0.49 kWh 0.36 kWh
Average Unit Peak Demand Savings 0.003 W 0.002 W
Expected Useful Life 25 years 25 years
Average Material & Labor Cost NA NA
Average Incremental Cost $0.81 $0.15
Stacking Effect End-Use HVAC
Floor Insulation 53

2.9.1. Definition of Eligible Equipment
Eligible floor area is limited to buildings or potions of buildings with central mechanical air
conditioning or PTAC systems. Qualifying Floor insulation can be rigid foam, fiberglass bat, or
blown-in fiberglass or cellulose a long as material is eligible, assuming it meets or exceeds the
required R-value. The insulation must upgrade from R5 or less. Added rigid insulation must
provide continuous insulation with an R-value of 10 minimum. Additional insulation measures
include installing R-13 and R-19.
2.9.2. Definition of Baseline Equipment
Baseline equipment for this measure is determined by the nature of the project. There are two
possible scenarios: retrofit (early replacement) or new construction.
Retrofit (Early Replacement)
If the project is retrofitting pre-existing insulation, then the baseline efficiency is defined by the
pre-existing insulation.
New Construction (New Construction, Replace on Burnout)
New Construction must meet building code and will only be eligible for added insulation above
building code. The baseline insulation should be determined for each building based on the
location and building type. The baseline flooring insulation for new construction is estimated at R-
13 continuous insulation.
2.9.3. Algorithms
The following energy and demand savings algorithms are applicable for this measure:
AkWh = AkWh000, + AkWhheat
AkWhcoo, = A* (CDD * 24)/(SEER * 3412) * (1/Rbase— 1/Rmeas)
AkWhheat = A* (HDD * 24)/(HSPF * 3412) * (1/Rbase— 1/Rmeas)
AkWpeak = AkWh000l / EFLH0001 * CF
2.9.4. Definitions
A Area of the insulation that was installed in square feet
HDD Heating degree days, refer to Table 2-64 for typical heating degree days
for different buildings. When possible, actual base temperatures should
be used to calculate the HDD
Floor Insulation 54

CDD Cooling degree days refer to Table 2-64 for typical cooling degree days
for different buildings. When possible, actual base temperatures should
be used to calculate the CDD.
Rbase The R-value of the insulation and support structure before the additional
insulation is installed
Rmeas The total measure R-value of all insulation after the additional insulation
is installed
EFLH Annual equivalent full load cooling hours for the air conditioning unit.
Values for various building types are stipulated in Table 2-64. When
available, actual system hours of use should be used.
SEER Seasonal Energy efficiency ratio of the air conditioning unit. This is defined
as the ratio of the Annual cooling provided by the air conditioner (in
BTU/hr), to the total electrical input (in Watts). Note that the IEER is an
appropriate equivalent. If the SEER or IEER are unknown or unavailable
use the following formula to estimate from the EER:
SEER24 = .0507 * EER2 + .5773 * EER + .4919
HSPF Heating Season Performance Factor. This is identical to the SEER
(described above) as applied to Heat Pumps in heating mode. If only the
heat pump COP is available, then use the following:
HSPF = .5651 * COP2 + .464 * COP + .4873
CF Peak coincidence factor. Represents the % of the connected load
reduction which occurs during Idaho Power's peak period.
2.9.5. Sources
■ ASHRAE, Standard 90.1-2019.
■ New York Standard Approach for Estimating Energy Savings from Energy Efficiency
Programs— Residential, Multi-Family, and Commercial/Industrial Measures, Version 9
■ California DEER Effective Useful Life worksheets: EUL_Summary_1 0-1-08.xls
■ I ECC 2018
■ 2019 California Residential Appliance Saturation Study (RASS)
2.9.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Table 2-63 Standard System Variables
CIF SEER HSPF,hp HSPF,elec
0.69 12.6 7.2 3.41
24 Note that this formula is an approximation and should only be applied to EER values up to 15 EER.
Floor Insulation 55

Table 2-64 Weather Zone Dependent Variables
EFLH,c EFLH,h CDD HDD
Zone 5 699 460 240 5,297
Zone 6 618 701 165 6,954
Oregon 526 722 107 7,094
Idaho Weighted Average 683 508 225 5,628
Floor Insulation 56

2.10. Reflective Roof
This section covers installation of"cool roof" roofing materials in multifamily buildings. Energy and
demand saving are realized through reductions in the building cooling loads. The approach
utilizes DOE-2.2 simulations on a series of commercial DEER prototypical building models.
Table 2-65 and Table 2-66 summarize the `typical' expected (per ft2) energy impacts for this
measure. Typical values are based on the algorithms and stipulated values described below. Low
Slope assumes a slope of less then 2:12 and Steep slope assumes a slope greater then 2:12
Table 2-65 Summary Deemed Savings Estimates for Reflective Roof, Idaho
Low Slope Steep Slope
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 0.093 kWh 0.017 kWh
Average Unit Peak Demand Savings 0.07 W 0.01 W
Expected Useful Life25 15 years 15 years
Average Material & Labor Cost26 $2.15 $2.15
Average Incremental Cost27 $0.05 $0.05
Stacking Effect End-Use HVAC
Table 2-66 Summary Deemed Savings Estimates for Reflective Roof, Oregon
Low Slope Steep Slope
Deemed Savings Unit Square Foot Square Foot
Average Unit Energy Savings 0.087 kWh 0.016 kWh
Average Unit Peak Demand Savings 0.07 W 0.01 W
Expected Useful Life 15 years 15 years
Average Material & Labor Cost $2.15 $2.15
Average Incremental Cost $0.05 $0.05
Stacking Effect End-Use HVAC
2.10.1. Definition of Eligible Equipment
Eligible equipment includes all reflective roofing materials when applied to the roof above a space
with central mechanical air conditioning or PTAC systems. The roof treatment must be Energy
Star rated or tested through a Cool Roof Rating Council (CRRC) accredited laboratory. For low-
25 From 2008 Database for Energy-Efficiency Resources (DEER), Version 2008.2.05, "Effective/Remaining Useful Life Values",
California Public Utilities Commission, December 16,2008
26 Labor costs from 2005 Database for Energy-Efficiency Resources (DEER), Version 2005.2.01, "Technology and Measure Cost
Data",California Public Utilities Commission,October 26,2005
2' Material costs from common roof types found in EPA's Reducing Urban Heat Islands: Compendium of Strategies:
http://www.epa.gov/heatisld/resources/pdf/Cool RoofsCompend i um.pdf
Reflective Roof 57

slope (2:12 or less) roofs, the roof products must have a solar reflectivity of at least 0.70 and
thermal emittance of 0.75. For steep slope (greater than 2:12) roofs, minimum solar reflectance
is 0.25. Note that facilities with pre-existing cool roofs are not eligible for this measure.
2.10.2. Definition of Baseline Equipment
There are two possible project baseline scenarios— retrofit and new construction.
Retrofit (Early Replacement)
The baseline equipment for retrofit projects is the pre-existing (non-cool roof) roofing material.
New Construction (Includes Major Remodel & Replace on Burn-Out)
The baseline equipment for new construction projects is a standard code compliant roofing (non-
cool roof) materials.
2.10.3.Algorithms
The following energy and demand savings algorithms are applicable for this measure:
AkWh = AkWh/Unit * A
AkW = AkW/Unit* A
2.10.4. Definitions
AkWh Expected energy savings between baseline and installed equipment.
AkW Expected demand reduction between baseline and installed equipment.
AkWh/Unit Per unit energy savings as stipulated in Table 2-68 according to climate zone.
AkW/Unit Per unit demand reduction as stipulated in Table 2-68 according to climate zone.
A Area of cool roofing material installed [ft2]
2.10.5.Sources
■ ASHRAE, Standard 90.1-2019.
■ California DEER Prototypical Simulation models, eQUEST-DEER 3-5.28
28 Prototypical building energy simulation models were used to obtain U-Factor and SHGC values for each building type.
Reflective Roof 58

ASHRAE. 2006. Weather data for building design standards. ANSI/ASHRAE Standard
169-2006.
2004-2005 Database for Energy Efficiency Resources (DEER) Update Study. December
2005
2008 Database for Energy-Efficiency Resources (DEER), Version 2008.2.05,
"Effective/Remaining Useful Life Values", California Public Utilities Commission,
December 16, 2008
2005 Database for Energy-Efficiency Resources (DEER), Version 2005.2.01, "Technology
and Measure Cost Data", California Public Utilities Commission, October 26, 2005
2.10.6. Stipulated Values
The following tables stipulate allowable values for each of the variables in the energy and demand
savings algorithms for this measure.
Table 2-67 Weather Zone Dependent Variables
EFLH,c EFLH,h CDD HDD
Zone 5 699 460 240 5,297
Zone 6 618 701 165 6,954
Oregon 526 722 107 7,094
Weighted Average 676 515 220 5,677
Table 2-68 Deemed Savings by Weather Zone
Low Slope Steep Slope
kWh/sf W/sf kWh/sf W/sf
Zone 5 0.093 0.072 0.017 0.013
Zone 6 0.090 0.071 0.016 0.013
Oregon 0.087 0.070 0.016 0.013
Reflective Roof 59

3. Appendix A: Document Revision History
Table 3-1 Document Revision History
Date Modified Revised Description of Changes
Version Version
09/20/2022 - 1.0 Initial Adoption of TRM.
Appendix A 60

Appendix A 61