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Heat pumps can't take the cold? Nordics debunk the myth
(techxplore.com)
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this post was submitted on 01 Nov 2023
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Not correct for modern heat pumps. They work down to at least -40F without switching to creating heat.
That's why I said it depends on the type of the heat pump. Some can go really low, the cheaper ones not. At some point (the latest at -273.15C :D) they need to switch.
The overwhelming majority of even high end cold climate ASHPs do not function at -40 C/F. -20F, that's doable.