So you can use ALL ove it except the condenser (outdoor coil) basically a geothermal system is excactly the same as a normal heat pump except for the condenser. Normal heat pump has a large refrigerant to air coil. The geothermal has a refrigerant to water coil istead. Something like this
https://www.doucetteindustries.com/P.../Coaxial-Coils
I just did a quick search.
Also if you read this thread it will help a lot
http://ecorenovator.org/forum/geothe...manifesto.html