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None, except where mechanical ventilation is specified <br /> by the proposed design, in which case: <br /> Annual vent fan energy use: <br /> Mechanical ventilation kWh/yr=0.03942 x CFA +29.565 X (Nor+ 1) As proposed <br /> where: <br /> CFA =conditioned floor area <br /> Nor=number of bedrooms <br /> Internal gains IGain= 17,900+23.8 x CFA +4104 x Nor (Btu/day per Same as standard <br /> dwelling unit) reference design <br /> Same as standard <br /> reference design, <br /> plus any additional <br /> mass specifically <br /> Internal mass An internal mass for furniture and contents of 8 pounds designed as a <br /> per square foot of floor area thermal storage <br /> element'but not <br /> integral to the <br /> building envelope <br /> or structure. <br /> For masonry floor slabs, 80 percent of floor area <br /> covered by R-2 carpet and pad, and 20 percent of floor As proposed <br /> directly exposed to room air. <br /> Structural mass For masonry basement walls, as proposed, but with <br /> insulation required by Table R402.1.4 located on the As proposed <br /> interior side of the walls <br /> For other walls, for ceilings, floors, and interior walls, As proposed <br /> wood frame construction <br /> heat pump, where the proposed design utilizes electric <br /> --1 •- . • -. . .. -- . - . . -. • [ <br /> design shall be an air source heat pump meeting the <br /> requirements of Section C403 of the IECC Commercial <br /> Provisions.] <br /> Heating systemsd°e Fuel type: same as proposed design. As proposed <br /> Efficiencies: As proposed <br /> Electric: Air-source heat pump with prevailing federal <br /> minimum standards. <br /> Nonelectric furnaces: natural gas furnace with As proposed <br /> prevailing federal minimum standards. <br /> Nonelectric boilers: natural gas boiler with prevailing As proposed <br /> federal minimum standards. <br /> Capacity: sized in accordance with Section R403.7. As proposed <br /> 23 <br />