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REVIEWED BLD2022-0046+Energy_Calculations+1.14.2022_1.13.08_PM+2622083U) ry cM O N C10 O O 00 RECEIVED BLD2022-0046 Jan 24 2022 2018 Washington State Energy Code — Residential CITY OF EDMONDS Prescriptive Energy Code Compliance for All Climate Zones in Washington DEVELOPMENT SERVICES � Single Family— New & Additions (effective February 1, 2021) DEPARTMENT These requirements apply to all IRC building types, including detached one- and two-family dwellings and multiple single-family dwellings (townhouses). Project Information Select Homes- Plan 3110 MIKE JOHNSOW mi Instructions: This single-family project will use the requirements of the Plescriptive Path beBvyaand incorporate the minimum values listed. Based on the size of the structurt�ela y3ri,ate-nµmbr-of DS additional credits are checked as chosen by the permit applicant. ((,�� �� Y� (�) tt ����//�� Provide all information from the following tables as building permit drawing#: Table R402.1- Insulation and Fenestration Requirements by Component, Table R406.2 -Fuel Normalizati - Authorized Representative Date All Climate Zones (Table R402.1.1) R-Value a U-Factor a Fenestration U-Factor b n/a 0.30 Skylight U-Factor b n/a 0.50 Glazed Fenestration SHGC b,e n/a n/a Ceiling 2 49 i 0.026 Wood Frame Wall g-h 21 int 0.056 Floor 30 0.029 Below Grade Wall `-h 10/15/21 int + TB 0.042 Slab dfR-Value & Depth 10, 2 ft n/a R-values are minimums. U-factors and SHGC are maximums. When insulation is installed in a cavity that is less a than the label or design thickness of the insulation, the compressed R-value of the insulation from Appendix Table A101.4 shall not be less than the R-value specified in the table. The fenestration U-factor column excludes skylights. b "10/15/21 +5TB" means R-10 continuous insulation on the exterior of the wall, or R-15 continuous insulation on the interior of the wall, or R-21 cavity insulation plus a thermal break between the slab and the basement wall at c the interior of the basement wall. "10/15/21 +5TB" shall be permitted to be met with R-13 cavity insulation on the interior of the basement wall plus R-5 continuous insulation on the interior or exterior of the wall. "5TB" means R-5 thermal break between floor slab and basement wall. d R-10 continuous insulation is required under heated slab on grade floors. See Section R402.2.9.1. For single rafter- or joist -vaulted ceilings, the insulation may be reduced to R-38 if the full insulation depth e extends over the top plate of the exterior wall. R-7.5 continuous insulation installed over an existing slab is deemed to be equivalent to the required perimeter f slab insulation when applied to existing slabs complying with Section R503.1.1. If foam plastic is used, it shall meet the requirements for thermal barriers protecting foam plastics. For log structures developed in compliance with Standard ICC 400, log walls shall meet the requirements for g climate zone 5 of ICC 400. Int. (intermediate framing) denotes framing and insulation as described in Section A103.2.2 including standard h framing 16 inches on center, 78% of the wall cavity insulated and headers insulated with a minimum of R-10 insulation. Prescriptive Path — Single Family 2018 Washington State Energy Code-R 2018 Washington State Energy Code - Residential Prescriptive Energy Code Compliance for All Climate Zones in Washington Single Family- New & Additions (effective February 1, 2021) Each dwelling unit in a residential building shall comply with sufficient options from Table R406.2 (fuel normalization credits) and Table 406.3 (energy credits) to achieve the following minimum number of credits. To claim this credit, the building permit drawings shall specify the option selected and the maximum tested building air leakage, and show the qualifying ventilation system and its control sequence of operation. 1. Small Dwelling Unit: 3 credits Dwelling units less than 1,500 sf in conditioned floor area with less than 300 sf of fenestration area. Additions to existing building that are greater than 500 sf of heated floor area but less than 1,500 sf. 2. Medium Dwelling Unit: 6 credits All dwelling units that are not included in #1 or #3 3. Large Dwelling Unit: 7 credits Dwelling units exceeding 5,000 sf of conditioned floor area 4. Additions less than 500 square feet: 1.5 credits All other additions shall meet 1-3 above Before selecting your credits on this Summary table, review the details in Table 406.3 (Single Family), on page 4 Summary of Table R406.2 Heating Credits - select ONE Options Fuel Normalization Descriptions heating option 1 Combustion heating minimum NAECAb 0.0 ❑ 2 Heat pump` 1.0 0 3 Electric resistance heat only - furnace or zonal -1.0 ❑ 4 DHP with zonal electric resistance per option 3.4 0.5 ❑ 5 All other heating systems -1.0 ❑ Credits - select ONE Energy Options Energy Credit Option Descriptions energy option from each p category 1.1 I> 71oouNN2 oo0e®oe 0.5 ❑ 1.2 Efficient Building Envelope 1.0 ❑ User Notes 1.3 Efficient Building Envelope 0.5 0 1.4 I Efficient Building Envelope 1 1.0 ❑ 1.5 Efficient Building Envelope 2.0 ❑ 1.6 Efficient Building Envelope 3.0 ❑ 1.7 Efficient Building Envelope 0.5 ❑ 2.1 Air Leakage Control and Efficient Ventilation 0.5 ❑ 2.2 Air Leakage Control and Efficient Ventilation 1.0 ❑ 2.3 Air Leakage Control and Efficient Ventilation 1.5 ❑ 2.4 Air Leakage Control and Efficient Ventilation 2.0 ❑ 3.1- High Efficiency HVAC 1.0 ❑ 3.2 High Efficiency HVAC 1.0 ❑ 3.3- High Efficiency HVAC 1.5 ❑ 3.4 High Efficiency HVAC 1.5 ❑ 3.5 High Efficiency HVAC 1.5 0 3.61 High Efficiency HVAC 2.0 ❑ 4.1 High Efficiency HVAC Distribution System 0.5 ❑ 4.2 High Efficiency HVAC Distribution System 1.0 0 Prescriptive Path - Single Family 2018 Washington State Energy Code-R 2 2018 Washington State Energy Code — Residential Prescriptive Energy Code Compliance for All Climate Zones in Washington Single Famille— New & Additions (effective February 1, 2021) Summary of Table R406.2 (cont.) Energy Credits - select ONE Options Energy Credit Option Descriptions (cont.) energy option from User Notes d each category 5.1d Efficient Water Heating 0.5 ❑ 5.2 Efficient Water Heating 0.5 ❑ 5.3 Efficient Water Heating 1.0 ❑ 5.4 Efficient Water Heating 1.5 ❑ 5.5 Efficient Water Heating 2.0 0 5.6 Efficient Water Heating 2.5 ❑ 6.1e Renewable Electric Energy (3 credits max) 1.0 0 7.1 Appliance Package 0.5 ❑ Total Credits 16.01 1 CLEAR FORM a. An alternative heating source sized at a maximum of 0.5 W/sf (equivalent) of heated floor area or 500 W, whichever is bigger, may be installed in the dwelling unit. b. Equipment listed in Table C403.3.2(4) or C403.3.2(5) c. Equipment listed in Table C403.3.2(1) or C403.3.2(2) d. You cannot select more than one option from any category EXCEPT in category S. Option 5.1 may be combined with options 5.2 through 5.6. See Table 406.3. e. 1.0 credit for each 1,200 kWh of electrical generation provided annually, up to 3 credits max. See the complete Table R406.2 for all requirements and option descriptions. Please print only pages 1 through 3 of this worksheet for submission to your building official. Prescriptive Path — Single Family 2018 Washington State Energy Code-R 3 2018 Washington State Energy Code — Residential Prescriptive Energy Code Compliance for All Climate Zones in Washington Single Family — New & Additions (effective February 1, 2021) Table 406.3 — Energy Credits (Single Family) Option Description Credits: SF 1. EFFICIENT BUILDING ENVELOPE OPTIONS Only one option from Items 1.1 through 1.7 may be selected in this category. Compliance with the conductive UA targets is demonstrated using Section R402.1.4, Total UA alternative, where [1- (Proposed UA/Target UA)] > the required %UA reduction Prescriptive compliance is based on Table R402.1.1 with the following modifications: 1.1 0.5 Vertical fenestration U = 0.24 Prescriptive compliance is based on Table R402.1.1 with the following modifications: 1.2 1.0 Vertical fenestration U = 0.20 Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U = 0.28 Floor R-38 1.3 Slab on grade R-10 perimeter and under entire slab below grade slab R-10 perimeter and 0.5 under entire slab or Compliance based on Section R402.1.4: Reduce the Total conductive UA by 5% Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U = 0.25 Wall R-21 plus R-4 ci Floor R-38 1.4 Basement wall R-21 int plus R-5 ci 1.0 Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.4: Reduce the Total conductive UA by 15% Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U = 0.22 Ceiling and single -rafter or joist -vaulted R-49 advanced Wood frame wall R-21 int plus R-12 ci Floor R-38 1.5 Basement wall R-21 int plus R-12 ci 2.0 Slab on grade R-10 perimeter and under entire slab Below grade slab R-10 perimeter and under entire slab or Compliance based on Section R402.1.4: Reduce the Total conductive UA by 30% Prescriptive compliance is based on Table R402.1.1 with the following modifications: Vertical fenestration U = 0.18 Ceiling and single -rafter or joist -vaulted R-60 advanced Wood frame wall R-21 int plus R-16 ci 1.6 Floor R-48 3.0 Basement wall R-21 int plus R-16 ci Slab on grade R-20 perimeter and under entire slab Below grade slab R-20 perimeter and under entire slab or Compliance based on Section R402.1.4: Reduce the Total conductive UA by 40%. Advanced framing and raised heel trusses or rafters Vertical Glazing U-0.28 1.7 R-49 Advanced (U-0.020) as listed in Section A102.2.1, Ceilings below a vented attic and 0.5 R-49 vaulted ceilings with full height of uncompressed insulation extending over the wall top plate at the eaves. Prescriptive Path — Single Family 2018 Washington State Energy Code-R 2018 Washington State Energy Code — Residential Prescriptive Energy Code Compliance for All Climate Zones in Washington Single Family — New & Additions (effective February 1, 2021) Table 406.3 — Energy Credits (Single Family) Option Description Credits: SF 2. AIR LEAKAGE CONTROL AND EFFICIENT VENTILATION OPTIONS Only one option from Items 2.1 through 2.4 may be selected in this category. Compliance based on R402.4.1.2: Reduce the tested air leakage to 3.0 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.3 cfm/sf maximum at 50 Pascals and All whole house ventilation requirements as determined by Section M1507.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall 2.1 be met with a high efficiency fan(s) (maximum 0.35 watts/cfm), not interlocked with the 0.5 furnace fan (if present). Ventilation systems using a furnace including an ECM motor are allowed, provided that they are controlled to operate at low speed in ventilation only mode. To qualify to claim this credit, the building permit drawings shall specify the option being selected and the maximum tested building air leakage, and shall show the qualifying ventilation system and its control sequence of operation. Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 2.0 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested 2.2 air leakage to 0.25 cfm/sf maximum at 50 Pascals and 1.0 All whole house ventilation requirements as determined by Section M1507.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.65. 1 Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 1.5 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested 2.3 air leakage to 0.25 cfm/sf maximum at 50 Pascals and 1.5 All whole house ventilation requirements as determined by Section M1507.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.75. 1 Compliance based on Section R402.4.1.2: Reduce the tested air leakage to 0.6 air changes per hour maximum at 50 Pascals or For R-2 Occupancies, optional compliance based on Section R402.4.1.2: Reduce the tested 2.4 air leakage to 0.15 cfm/sf maximum at 50 Pascals and 2.0 All whole house ventilation requirements as determined by Section M1507.3 of the International Residential Code or Section 403.8 of the International Mechanical Code shall be met with a heat recovery ventilation system with minimum sensible heat recovery efficiency of 0.80. Duct installation shall comply with Section R403.3.7. 1 1 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the maximum tested building air leakage and shall show the heat recovery ventilation system. Prescriptive Path — Single Family 2018 Washington State Energy Code-R 2018 Washington State Energy Code — Residential Prescri tive Energy Code Compliance for All Climate Zones in Washington ami Table 406.3 — Energy Credits (Single Family) Option Description Credits: SF 3. HIGH EFFICIENCY HVAC EQUIPMENT OPTIONS Only one option from Items 3.1 through 3.6 may be selected in this category. 3.1 z Energy Star rated (U.S. North) Gas or propane furnace with minimum AFUE of 95% or 1.0 Energy Star rated (U.S. North) Gas or propane boiler with minimum AFUE of 90%. Z 3.2 2 Air -source centrally ducted heat pump with minimum HSPF of 9.5. 3 1.0 Closed -loop ground source heat pump; with a minimum COP of 3.3 or 3.32 Open loop water source heat pump with a maximum pumping hydraulic head of 150 feet 1.5 and minimum COP of 3.6. s Ductless mini -split heat pump system, zonal control: In homes where the primary space 3.4 heating system is zonal electric heating, a ductless mini -split heat pump system with a 1.5 minimum HSPF of 10.0 shall be installed and provide heating to the largest zone of the housing unit. 4 3.5 Z Air -source, centrally ducted heat pump with minimum HSPF of 11.0.4 1.5 Ductless split system heat pumps with no electric resistance heating in the primary living areas. A ductless heat pump system with a minimum HSPF of 10 shall be sized and installed to provide heat to entire dwelling unit at the design outdoor air temperature. 3.6 Z 2.0 To qualify to claim this credit, the building permit drawings shall specify the option being selected, the heated floor area calculation, the heating equipment type(s), the minimum equipment efficiency, and total installed heat capacity (by equipment type). Z An alternative heating source sized at a maximum of 0.5 W/sf(equivalent) of heated floor area or 500 W, whichever is bigger, may be installed in the dwelling unit. 3 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. 4 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and the minimum equipment efficiency. 4. HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM OPTIONS All supply and return ducts located in an unconditioned attic shall be deeply buried in ceiling insulation in accordance with Section R403.3.7. For mechanical equipment located outside the conditioned space, a maximum of 10 linear feet of return duct and 5 linear feet of supply duct connections to the equipment may be outside the deeply buried insulation. All metallic ducts located outside the conditioned 4.1 space must have both transverse and longitudinal joints sealed with mastic. If flex ducts 0.5 are used, they cannot contain splices. Duct leakage shall be limited to 3 cfm per 100 square feet of conditioned floor area. Air handler(s) shall be located within the conditioned space. HVAC equipment and associated duct system(s) installation shall comply with the requirements of Section R403.3.7. Locating system components in conditioned crawl spaces is not permitted under this option. 4.2 Electric resistance heat and ductless heat pumps are not permitted under this option. 1.0 Direct combustion heating equipment with AFUE less than 80% is not permitted under this option. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating equipment type and shall show the location of the heating and cooling equipment and all the ductwork. Prescriptive Path — Single Family 2018 Washington State Energy Code-R 2018 Washington State Energy Code — Residential Prescriptive Energy Code Compliance for All Climate Zones in Washington Single Family — New & Additions (effective February 1, 2021) Table 406.3 — Energy Credits (Single Family) Option Description Credits: SF . EFFICIENT WATER HEATING OPTIONS Only one option from Items 5.2 through 5.6 may be selected in this category. Item 5.1 may be combined with any option. A drain water heat recovery unit(s) shall be installed, which captures waste water heat from all and only the showers, and has a minimum efficiency of 40% if installed for equal flow or a minimum efficiency of 54% if installed for unequal flow. Such units shall be rated in accordance with CSA B55.1 or IAPMO IGC 346-2017 and be so labeled. 5.1 0.5 To qualify to claim this credit, the building permit drawings shall include a plumbing diagram that specifies the drain water heat recovery units and the plumbing layout needed to install it. Labels or other documentation shall be provided that demonstrates that the unit complies with the standard. Water heating system shall include one of the following: 5.2 0.5 Energy Star rated gas or propane water heater with a minimum UEF of 0.80. 5 Water heating system shall include one of the following: Energy Star rated gas or propane water heater with a minimum UEF of 0.91 or Solar water heating supplementing a minimum standard water heater. Solar water heating will provide a rated minimum savings of 85 therms or 2000 kWh based on the Solar Rating and Certification Corporation (SRCC) Annual Performance of OG-300 Certified Solar Water Heating 5.3 Systems or 1.0 Water heater heated by ground source heat pump meeting requirements of Option 3.3. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency and, for solar water heating systems, the calculation of minimum energy savings. Water heating system shall include one of the following: Electric heat pump water heater meeting the standards for Tier I of NEEA's advanced water heating specification or 5.4 For R-2 Occupancy, electric heat pump water heater(s), meeting the standards for Tier I of 1.5 NEEA's advanced water heating specification, shall supply domestic hot water to all units. If one water heater is serving more than one dwelling unit, all hot water supply and recirculation piping shall be insulated with R-8 minimum pipe insulation. 5 Water heating system shall include one of the following: Electric heat pump water heater meeting the standards for Tier III of NEEA's advanced water heating specification or 5.5 For R-2 Occupancy, electric heat pump water heater(s), meeting the standards for Tier III of 2.0 NEEA's advanced water heating specification, shall supply domestic hot water to all units. If one water heater is serving more than one dwelling unit, all hot water supply and recirculation piping shall be insulated with R-8 minimum pipe insulation. 5 Water heating system shall include one of the following: Electric heat pump water heater with a minimum UEF of 2.9 and utilizing a split system configuration with the air -to -refrigerant heat exchanger located outdoors. Equipment shall meet Section 4, requirements for all units, of the NEEA standard Advanced Water Heating Specification with the UEF noted above or 5.6 2.5 For R-2 Occupancy, electric heat pump water heater(s), meeting the standards for Tier III of NEEA's advanced water heating specification and utilizing a split system configuration with the air -to -refrigerant heat exchanger located outdoors, shall supply domestic hot water to all units. If one water heater is serving more than one dwelling unit, all hot water supply and recirculation piping shall be insulated with R-8 minimum pipe insulation. 5 5 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the water heater equipment type and the minimum equipment efficiency. Prescriptive Path — Single Family 2018 Washington State Energy Code-R 2018 Washington State Energy Code — Residential Prescriptive Energy Code Compliance for All Climate Zones in Washington Single Family — New & Additions (effective February 1, 2021) Table 406.3 — Energy Credits (Single Family) Option Description Credits: SF 6. RENEWABLE ELECTRIC ENERGY OPTION For each 1200 kWh of electrical generation per housing unit provided annually by on -site wind or solar equipment a 1.0 credit shall be allowed, up to 3 credits. Generation shall be calculated as follows: For solar electric systems, the design shall be demonstrated to meet this requirement using the National Renewable Energy Laboratory calculator PVWATTs or approved alternate by the code official. 6.1 Documentation noting solar access shall be included on the plans. For wind generation 1.0 projects designs shall document annual power generation based on the following factors: the wind turbine power curve; average annual wind speed at the site; frequency distribution of the wind speed at the site and height of the tower. To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall show the photovoltaic or wind turbine equipment type, provide documentation of solar and wind access, and include a calculation of the minimum annual energy power production. 7. APPLIANCE PACKAGE OPTION All of the following appliances shall be new and installed in the dwelling unit and shall meet the following standards: Dishwasher — Energy Star rated Refrigerator (if provided) — Energy Star rated Washing machine — Energy Star rated 7.1 Dryer— Energy Star rated, ventless dryer with minimum CEF rating of 5.2 To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall show the appliance type and provide documentation of Energy Star compliance. At the time of inspection, all appliances shall be installed and connected to utilities. Dryer ducts and exterior dryer vent caps are not permitted to be installed in the dwelling unit. 0.5 Prescriptive Path — Single Family 2018 Washington State Energy Code-R =MEMO IMINE =MEMO : INMEME ©MEMO ©MEMO : INME©O ©MEMO EI©NI©O : IN©EMO IN©NIME EIRENIME : INEINIME INMEME INMEME Ml_ =MEMO INMEME ©MEMO ©MEMO =MEMO INMEME INMEME SMINE =MEMO SMINE =MEMO MINE =MEMO SMINE =MEMO SMINE =MEMO MINE =MEMO SMINE =MEMO SMINE =MEMO MINE =MEMO SMINE =MEMO SMINE =MEMO MINE =MEMO SMINE =MEMO SMINE =MEMO MINE =MEMO IMINE =MEMO MMEME MMEME MMEME MMEME MMEM mmmmm simple cleating System size: wasnington state This heating system sizing calculator is based on the Prescriptive Requirements of the 2018 Washington State Energy Code (WSEC) and ACCA Manuals J and S. This tool will calculate heating loads only. ACCA procedures for sizing cooling systems should be used to determine cooling loads. Please complete the green drop -downs and boxes that are applicable to your project. As you make selections in the drop -downs for each section, some values will be calculated for you. If you do not see the selection you need in the drop -down options, please contact the WSU Energy Program at energycode@energy.wsu.edu or (360) 956-2042 for assistance. Project Information Contact Information Plan 3110 Heating System Type: O All other Systems ® Heat Pump To see detailed instructions for each section, place your cursor on the word 'Instructions" Design Temperature Instructions Design Temperature Difference (AT) Edmonds AT = Indoor (70 degrees) - Outdoor Design Temp Area of Building Conditioned Floor Area Instructions Conditioned Floor Area (sq ft) 3,110 Average Ceiling Height Conditioned Volume Instructions Average Ceiling Height (ft) 9.0 27,990 Glazing and Door U-Factor X Area = UA Instructions 0.280 655 183.40 Skylights U-Factor X Area = UA Instructions 0.50 Insulation Attic U-Factor X Area = UA Instructions R-49 IV 0.026 2,100 54.60 Single Rafter or Joist Vaulted Ceilings U-Factor X Area UA Instructions No Vaulted Ceilings in this project. VJ --- Above Grade Walls (see Figure 1) U-Factor X Area UA Instructions R-21 Intermediate � 0.056 2,890 161.84 Floors U-Factor X Area UA Instructions 0.025 2,100 52.50 11-38 � Below Grade Walls (see Figure 1) U-Factor X Area UA Instructions 1d9elra o ow Gde Walls in this project. 0.028 Slab Below Grade (see Fioure 1) F-Factor X Length UA Instructions Select conditioning � No selection --- Slab on Grade (see Figure 1) F-Factor X Length UA Instructions LNo Slab an Grade in this project. --- Location of Ducts Instructions k—landitioned Duct Leakage Coefficient Spare 1.00 Sum of UA 452.34 Figure 1. Above Grade 46 Envelope Heat Load 20,808 Btu / Hour Sum of UA x AT Air Leakage Heat Load 13,905 Btu / Hour Volume x 0.6 x AT x 0.018 Building Design Heat Load 34,713 Btu / Hour Air leakage + envelope heat loss Building and Duct Heat Load 34,713 Btu / Hour Ducts in unconditioned space: sum of building heat loss x 1.10 Ducts in conditioned space: sum of building heat loss x 1 Maximum Heat Equipment Output 43,391 Btu / Hour Building and duct heat loss x 1.40 for forced air furnace Building and duct heat loss x 1.25 for heat pump (07101113)