nostr:npub1kv0ths4lytffs4507zruj0mhchzw3f46dzsenal9950w4l3rymjqszfeze nostr:npub1xjeknzjsdcqg40lnz47cm3qmppf33kq62jyqh4pjptupfqj3zf5qlc85rf 

It is very hard to find quantitative data on heat pump efficiency across different temperatures, but saying they are superior to resistive heating and gas at -30C (-22F) seems dubious.

If true, why would people in Norway spend tens of thousands USDs to drill down to ground water?