I'm sure everyone is familiar with Elon's ramblings about creating a Tesla Home HVAC that seem to get more serious every day. After learning about heat pumps, which was a new concept for me, I also learned about "geothermal heat pumps". Obviously the heat pump is more efficient when transfers to 55 deg earth vs 100/32 degree air. So I'm confused why is there so much talk about improving the efficiency of heat pumps themselves, while at the same time ignoring "geothermal heat pumps" which are more efficient no matter how much the heat pumps improve. It just seems to me like people don't know what geothermal is - I didn't know myself until recently. I thought you needed a volcano for geothermal anything. Sure, you need to dig or drill a hole, but I think that that is overrated. Big deal, we have machines that can drill holes. New homes can have geothermal installed even more cheaply, and there are new buildings made every day, but I bet that few have geothermal.