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Jean Richer
Jean Richer May 24, 2020, 11:11 a.m. Reply

A cheap way is to build a "puit canadien" : https://www.google.com/url?sa=t&source=web&rct=j&url=https://en.m.wikipedia.org/wiki/Ground-coupled_heat_exchanger&ved=2ahUKEwjl8sri48zpAhWKTN8KHa4yC7AQmhMwDXoECAgQAg&usg=AOvVaw0DBUKjgylux96YLmLg8ybi&cshid=1590332951061