Derek Caelin is writing a book on Nostr: nprofile1q…lvf6m A cold-climate heat pump sounds amazing. We hit -17 Celcius this ...

nprofile1qy2hwumn8ghj7un9d3shjtnyd968gmewwp6kyqpqwr5ev2agwddm3zt48dlr5nhujfkjxxtn3pmtd0cxg8ddlkaspm7shlvf6m (nprofile…vf6m) A cold-climate heat pump sounds amazing. We hit -17 Celcius this winter and had to shift to oil backups. Is the system burried underground?