Comment by lsaferite

In the South-East US we've used Heat Pumps for at least 35-40+ years. Probably longer, I'm just lowering the number because I was a kid and don't know when they became the norm exactly. We don't have strong winters here so even the older heat pumps were fine with keeping houses warm. And we had/have resistive electric heating to supplement if the temp dropped too fast or too low.