Only suggestions I have is reconsider not running a natural gas line. Cooking on electricity is not great, and wood is really bad for pollution. I understand t

Only suggestions I have is reconsider not running a natural gas line. Cooking on electricity is not great, and wood is really bad for pollution. I understand the Russia situation, but geopolitics changes all the time, and the house is likely to stand for a long time. Since you seem to be in Europe, and you want an air source heat pump, I would suggest this product for your heating: Lochinvar LCGHPi-40HT. Then instead of using your electricity to (inefficiently) run a heat pump, send the electricity back out on the grid, while using more efficient natural gas. And then you help CO2 emissions in a more globally way, rather than just by your house. CO2 acts globally after all. Even with the gas leakage, natural gas is still worth it over heating with electricity. I think you have something like 1/5 the emissions of electricity (and remember your PV going back on the grid reduces fuel consumption elsewhere).