Self-built houses have a large area and poor external wall insulation. There is no natural gas, so the circulation system cannot be considered! So you suggest that you use ground source heat pump or air source heat pump. Rural self-built houses should have large open spaces; The later use cost is relatively economical; It can be used for cooling and heating; The disadvantage is that the pre-installation cost is high. Air source heat pump needs high ambient temperature. The greater the temperature difference between the air temperature and the refrigerant in the main engine, the better the use effect, and the smaller the temperature difference, the worse the use effect. If only two or three rooms are used, heating cables can be used, with low cost and convenient use. Don't worry about maintenance.

Responder: three warm floor heating. If you have any questions, you can also go to Baidu Space to read my blog post.