> Well that installer cutoff was likely waaaaay too high. Your heat pump should be fine to 30F, maybe even 25F before needing gas. The parent post was saying i

> Well that installer cutoff was likely waaaaay too high. Your heat pump should be fine to 30F, maybe even 25F before needing gas. 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/ https://ashp.neep.org/#!/product_list/