FWIW, I live in a pretty cold climate (dips below -30C every year) where a lot of people do use heat pumps. They just lose efficiency at low temps and have to r

FWIW, I live in a pretty cold climate (dips below -30C every year) where a lot of people do use heat pumps. They just lose efficiency at low temps and have to rely on resistive heating. AC is not very common, so that might play a factor. The efficiency loss is more acceptable if it means you can get some cooling in the summer.