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2013 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: 5F <br /> 3.HIGH EFFICII:NC)(HVAC EQUIPMENT OPTIONS <br /> Only one optioi from Items 3.1 through 3.6 may be selected in this category. <br /> 3.12 Energy Star rated(U.S.North)Gas or propane furnace with minimum AFUE of 95%or <br /> Energy Star rated(U.S.North)Gas or propane boiler with minimum AFUE of!LO_%_.2 1"0 <br /> 3.2 2 Air-source centrally ducted hear,pump with minimum HSPF of 9.5.3 1.0 <br /> Clcsed••loop ground source neat pump;with a minirrum 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 prirnary space <br /> 3.4 heating system is zonal electric neating,a ductless rr ini-split heat pump systE m with a 1.5 <br /> minimum HSPF of 10.0 shall be nstalled and provide heating to the largest zone of the <br /> ho jsing unit.4 <br /> 3.51 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 minimurr 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 cpticn 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 /> - An alternatives heating source sized at a maxmum of 6.5 W/if(egiiivalent)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 sel acted and shall specify <br /> the heating equipment type and the mi iimum 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 mi iimum equipment efficiency. <br /> 4.HIGH EFFICIENCY HVAC DISTRIBUTION SYSTEM OPTIONS <br /> j Alf 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'ocated outside the cond tioned space,a maximum of 10 linear <br /> feEt of return duct and 5 linear reet of supply duct connections to the equipment may be <br /> 4.1 ou':side the deeply buried insulation.All metallic ducts located outside the conditioned 0.5 <br /> space must have both transverse and longitudinal joints sealed with mastic. P-flex ducts <br /> are used,they cannot contE in splices. <br /> Duct leakage shall be limitel to 3 cfm per 100 square feet of conditioned floc r area. <br /> Air handlers)shall be located within the conditioned space. __ <br /> HVAC equipment and associated duct system(s)installation shall comply with the <br /> requirE ments of Section R403.3.7. <br /> Locating system componerr:s 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 /> op'Jon. <br /> To qualify to claim this credit,the building permit dr)wirigs shall specify the c pticn being <br /> selected and shall specify th e heating equipment type and shall show the location of the <br /> heating and coolling equipment and all the ductwork. <br /> Prescriptive Path -Sirgle Family 2)18 Washington State Energy Code-R 6 <br />