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17°F isn't the point at which my heat pump stops working. It's just the lower temperature conventionally used as a point of comparison on the spec sheets for su
by wtallis 4y ago
17°F isn't the point at which my heat pump stops working. It's just the lower temperature conventionally used as a point of comparison on the spec sheets for such devices. There's another column on the spec sheet for 47°F (where my heat pump model is listed as having a CoP of 3.6).
And as for the question about colder climates: it's not a matter of whether an area can occasionally experience temperatures below eg. 17°F. What matters is whether you'll ever experience daily highs that are cold enough to prevent heating the house.
- 8note 4y agoThe question is what the cop is at -20C though, which is a fairly common winter temperature, and you really need heat at -40
- wtallis 4y agoI was responding specifically to this bit: "Once it hits 0C the efficiency is very low, and by -10C is almost doing nothing at all." I've refuted that. If you want to discuss some more distant goalposts, I won't be able to offer firsthand evidence.
- SV_BubbleTime 4y agoYou are free to refute that. Doesn’t make it wrong. At -10C you are hardly pulling anything from the air, but you are spending electricity to keep your coils free of frost, as inefficiently as possible. Do you not know how a heat pump works in cold weather?