I understand geothermal units are, in a way, a form of heat pump. The units I inspected today are listed as geothermal, but I consider them hot water heat.
The loop is only between the water heater and furnaces. There is no ground loop. My theory is the units are using hot water from the gas fired water heater instead of air exchange.
There was a note on the water heater that said not to open the loop valve because there was a pipe leak in the attic.
All the units operated at the inspection, and seemed to be working.
I’m wondering if I should describe the heating systems as a heat pump, rather than geothermal, since the loop is not underground?