> Electric heat pumps actually don't work in very cold weather. You can use heat pumps with a underground heat sink (not sure what they are called in english).

> Electric heat pumps actually don't work in very cold weather. You can use heat pumps with a underground heat sink (not sure what they are called in english). However, they really only make sense in climates where it is extensively below -10 degree Celcius. Even in southern Sweden they don't really make much sense.