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2018 Washington State Energy Code—Residential <br /> Prescriptive Energy Code Compliance for All Climate Zones in Washington <br /> Single Family—New&Additions (effective February 1, 2021) <br /> Table 406.3—Energy Credits(Single Family) <br /> Option Description Credits:SF <br /> 3. HIGH EFFICIENCY HVAC EQUIPMENT OPTIONS <br /> Only one option from Items 3.1 through 3.6 may be selected in this category. <br /> 3.1 2 Energy Star rated (U.S. North)Gas or propane furnace with minimum AFUE of 95%or 1.0 <br /> Energy Star rated(U.S. North)Gas or propane boiler with minimum AFUE of 90%.2 <br /> 3.2 2 Air-source centrally ducted heat pump with minimum HSPF of 9.5.3 1.0 <br /> Closed-loop ground source heat pump;with a minimum COP of 3.3 or <br /> 3.32 Open loop water source heat pump with a maximum pumping hydraulic head of 150 feet 1.5 <br /> and minimum COP of 3.6.3 <br /> Ductless mini-split heat pump system, zonal control: In homes where the primary space <br /> 3.4 heating system is zonal electric heating,a ductless mini-split heat pump system with a 1.5 <br /> minimum HSPF of 10.0 shall be installed and provide heating to the largest zone of the <br /> housing unit.4 <br /> 3.5 2 Air-source, centrally ducted heat pump with minimum HSPF of 11.0.4 1.5 <br /> Ductless split system heat pumps with no electric resistance heating in the primary living <br /> areas.A ductless heat pump system with a minimum HSPF of 10 shall be sized and <br /> installed to provide heat to entire dwelling unit at the design outdoor air temperature. <br /> 3.6 2 2.0 <br /> To qualify to claim this credit,the building permit drawings shall specify the option being <br /> selected,the heated floor area calculation,the heating equipment type(s),the minimum <br /> equipment efficiency, and total installed heat capacity(by equipment type). <br /> 2 An alternative heating source sized at a maximum of 0.5 W/sf(equivalent)of heated floor area or 500 W,whichever is <br /> bigger,may be installed in the dwelling unit. <br /> 3 To qualify to claim this credit,the building permit drawings shall specify the option being selected and shall specify <br /> the heating equipment type and the minimum equipment efficiency. <br /> 4 To qualify to claim this credit,the building permit drawings shall specify the option being selected and shall specify <br /> the heating equipment type and the minimum equipment efficiency. <br /> 4. HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM OPTIONS <br /> All supply and return ducts located in an unconditioned attic shall be deeply buried in <br /> ceiling insulation in accordance with Section R403.3.7. <br /> For mechanical equipment located outside the conditioned space, a maximum of 10 linear <br /> feet of return duct and 5 linear feet of supply duct connections to the equipment may be <br /> outside the deeply buried insulation.All metallic ducts located outside the conditioned <br /> 4.1 space must have both transverse and longitudinal joints sealed with mastic. If flex ducts 0.5 <br /> are used,they cannot contain splices. <br /> Duct leakage shall be limited to 3 cfm per 100 square feet of conditioned floor area. <br /> Air handler(s)shall be located within the conditioned space. <br /> HVAC equipment and associated duct system(s)installation shall comply with the <br /> requirements of Section R403.3.7. <br /> Locating system components in conditioned crawl spaces is not permitted under this <br /> option. <br /> 4 2 Electric resistance heat and ductless heat pumps are not permitted under this option. 1.0 <br /> Direct combustion heating equipment with AFUE less than 80%is not permitted under this <br /> option. <br /> To qualify to claim this credit,the building permit drawings shall specify the option being <br /> selected and shall specify the heating equipment type and shall show the location of the <br /> heating and cooling equipment and all the ductwork. <br /> Prescriptive Path—Single Family 2018 Washington State Energy Code-R 6 <br />