thanks so much @mountainjewel!!!!! cherimoya in utah yeeeehawwwwww!!!!!!! we can't wait to bite into them one day! we don't heat the greenhouse at all. there's many passive ways it heats itself. but our temps still get down close to freezing inside the dome. but the pond....keeps things..just above. thermal gain! check out the design right here: https://geodesic-greenhouse-kits.com/home_greenhouse_kits/greenhouse_design/