Heat Pump +/- gas furnace
I am building in the mountains of western NC, Zone 4. The bid calls for a Trane 17 SEER, 9.6 HSPF two-stage, variable speed heat pump with a gas furnace backup.The house will be about 4000sf on 2 floors over a crawl, very well insulated, tight, triple pain windows with 10kW of solar. Do you think this is the correct choice for HVAC or is there something better(always considering cost, of course)? Is the gas furnace backup needed?
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