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Oxford study proves heat pumps triumph over fossil fuels in the cold
(www.nationalobserver.com)
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this post was submitted on 12 Sep 2023
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It's fine. We use geothermal heat pumps with the lines buried below the frost line. (6-8 feet below the surface.) I know quite a few houses and even a few factories (30,000 square feet+) that use them in temps that drop well below -30c to -40c without any issues.
The initial setup cost is a fair bit more because of having to bury the lines, but after that they're fine.