Thank you Ac and gadget for your answers . Want I want it to know it was your opinion about the idea . I must admit that I'm not very good when it comes to thermodynamics and that's why i was asking for your opinion . Maybe the the best would be to see if I can find a solution for boreholes done as cheap as possible , maybe a diy solution . I was quoted around $7000 for two boresoles , each 150 metres deep . It's way to much and I can not afford that at the moment , I rather keep my diy air source heat pump .
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