I noticed we have about 6 days coming with the daytime Temps around -10 and night time Temps -20. I have always just left the heat pump run when it has got below -13 but that was maybe a day or 2 at night with daytime Temps going above zero.
It seems that these coming Temps will be at the very extreme for the heat pump.
Do you think I should turn the heat pump off and just plug in an electric heater or just let the heat pump run and see if it will heat? The apartment is only 800sf. and very well insulated and very air tight.
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