"Heat pumps work best when you maintain a room at a stable, comfortable temperature." Right, but for this to be economical, you need to have a well-insulated h

"Heat pumps work best when you maintain a room at a stable, comfortable temperature." Right, but for this to be economical, you need to have a well-insulated house, which is pretty much impossible to retrofit. So practically speaking, only newly build houses (and then, only those to the highest energy standards) should use heat pumps for heating. If we go around promoting them for other purposes, they will build up a reputation for being a crappy solution and people will shy away from them. That's my main problem with people promoting them - they often promote them for retrofits.