Quote:
Originally Posted by Fuzz
I just checked my furnace in a 1000 sqft bungalow, it's 60 000 BTU. In -20 it's running fairly often, and if I turn it down to 16 when out, it needs a good hour to heat up the house. So with only 34 000 btu at -20, I suspect it could not keep up. So I can't see it working in a larger house, and in mine I suspect I'd need supplemental heating below -10.
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Heat pumps don't really make a lot of sense in a climate like Calgary's given how the electricity is generated.
That said, the specs listed above are for a 36K BTU-rated heat pump, so it's not surprising that it wouldn't be able to heat as well as a 60K BTU furnace. If you had 60K in heat pump capacity, it'd heat the space just fine. And heat pumps are also most efficient when they're running at a lower than maximum output, so those COP numbers above are understated compared to likely real-world use.