Isnt geo thermo kinda the same ? So far down in the earth a constant temp ? So you drill down pipe it pump fluid and it and use the temp to cool or heat ?
My son has 3 Geothermal wells on his house and yep works pretty good but the pay back from the cost of drilling and everything takes many years to pay for it and if nothing breaks down then Yea good. Not really up on that I can't afford it.