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Heat pumps twice as efficient as fossil fuel systems in cold weather, study finds
(www.theguardian.com)
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But only for the 4 weeks a year you spend in unusually cold weather, the other 48 it's more efficient.
It's not like truly arctic places are a reasonable application but the overwhelming majority of our population lives south of Quebec and north of Wellington. So it's not a relevant point, everyone in the Arctic can just use resistive heating or burn fuel, and if we get everything else on heat pumps we reduce our enegy use by a factor of 2-3 regardles.
Right. It depends on your climate.