this post was submitted on 27 Nov 2024
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I have a newer 23 SEER pump now, and it's pretty terrible at that temperature. The draw is approaching resistive at -20 and beyond that, well, don't even bother. If I compare costs to running my backup furnace past -15 vs the electricity costs to force it to work at that temperature, I turn off the heat pump.
Yes, for about 90% of the work these pumps do, they are efficient and cost effective, as well as cooling in the summer. But this blue-sky thinking that they can replace NG heating in places like the Canadian Prairies is a pipe dream at this time.