Heat pumps are quite prevalent here in Norway, where we regularly see -5F or lower. I got one and while this winter has been mild, not much below 15F so far, l

Heat pumps are quite prevalent here in Norway, where we regularly see -5F or lower. I got one and while this winter has been mild, not much below 15F so far, last winter we had couple of weeks below -5F and we had a nice 73F indoor without issues. And to be frank I don't care if it's less efficient couple of weeks during winter if it's more efficient the remaining 50 weeks. Bonus points is that it can keep us cool during summer, unlike a furnace or heating panels.