[monkeynotes]

> Caution to the reader who thinks one could pump heat from frigid external temperatures into their very warm, high temperature house

I heat my house with a heat pump. I live in Eastern Canada and we regularly have -20c days and I still heat my house to a comfortable level. Our pump is >=100% efficient all the way down to around -25c at which point it's less and less effective.

These pumps are extremely popular around here. We heat during the winter and cool during the summer with the same unit.

I consider our heat pumps to be our primary source of heat in our house. We only run the gas furnace if we get into sub -25c days which is not often, we had none this year.