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Pen_Active t1_j73svzr wrote on February 3, 2023 at 9:32 PM

Reply to comment by ResponsibleExcuse727 in How is your heat pump holding up in this weather? by Vermontess

This will vary dramatically on the model. Most run at 100% efficiency down to around 20f. Cold-climate models will maintain their cost efficiency compared to oil, LNG, or LP to below 0f and operate below -20f when needed.