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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 3. HIGH EFFICIENCY HVAC EQUIPMENT OPTIONS Only one option from Items 3.1 through 3.6 may be selected in this category. 3 1 2 Energy Star rated (U.S. North) Gas or propane turnace with minimum AFUE of 95% or 1.0 Energy Star rated (U.S. North) Gas or propane boiler with minimum AFUE of 90%. 2 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. 3 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 minimum HSPF of 10.0 shall be installed and provide heating to the largest zone of the 1.5 housing unit." 3.52 Air -source, centrally ducted heat pump with minimum HSPF of 11.0. ° 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 2 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). An alternative heating source sized at a maximum of 0.5 W/sf(equivalent) of heated floor area or 500 , hichever, is bigger, may be installed in the dwelling unit. 13 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. a To qualify to claim this credit, the building permit drawings shall specify the option being selected and shall specify the heating e uq ipment tyke 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 4.1 outside the deeply buried insulation. All metallic ducts located outside the conditioned space must have both transverse and longitudinal joints sealed with mastic. If flex ducts .are used, they cannot contain splices. Duct leakage shall be limited to 3 cfm per 100 square feet of conditioned floor area. 4.2 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. Electric resistance heat and ductless heat pumps are not permitted under this option. 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. 0.5 Prescriptive Path — Single Family 2018 Washington State Energy Code-R 6