My father has solar and a heat pump. His cummulative heating and electrical cost is practically zero over the year. On many days the solor panels produce more t

My father has solar and a heat pump. His cummulative heating and electrical cost is practically zero over the year. On many days the solor panels produce more than he can use so he gets money for feeding it into the grid. If the roof of your house produces enough electricity for the people living it and the heating (and cooling) of all rooms, it is a no brainer to switch to a form of heating that relies on electricity.