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A comment on US companies are producing heat pumps that work below -20F(-28C). Parent comment
The parent post was saying it's cheaper to use natural gas at those temps, so that's why the installer did the cutoff there.
You can look at COP numbers for heat pumps here: https://ashp.neep.org/#!/product_list/
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The parent post was saying it's cheaper to use natural gas at those temps, so that's why the installer did the cutoff there.
You can look at COP numbers for heat pumps here: https://ashp.neep.org/#!/product_list/