Try as i might, i just don't understand how these work https://lowimpact.org/factsheet_ground_source_heat_pumps.html
Isn't it just a low power/low heat reverse cycle air conditioner with the external cooling unit buried and in the form of low cost plastic rather than a finned unit?
Ta, will study the article i should have paid more attention in physics classes at school I think I seem to have as much problem with this as others seem to have with the concept of biochar