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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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Yes, there are cold weather heat pumps that can thaw the coils to keep operating. There is a point where they just can't continue to operate.
When I design a heat pump system in cold climates, I always include a secondary hear source that kicks in if the heat pump gets overwhelmed. Might be a gas section in a furnace. Might be an electric heater in a fan coil. Might be electric baseboards or wall heaters.