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I am in the Northeast region, heating dominated. Cooling dominated areas can use GSHP's with a good vertical heat exchanger.

ChrisJ RI

CT77,
I am not "in the geo industry", Just someone w/geo in my 2 yr old home. Here are some numbers to think about.
Old house 1200' ranch, oil heat, propane for stove and of course an electric...

"because if Radiant has priority over forced air it will just run all day long trying to satisfy the radiant load".

The Hydron Module combo unit can be configured with shared priorty.

"Shared...

My horizontal loop was installed with a PVC piped drip loop about 12-18" above HDPE pipes. I can introduce moisture to the soil if need be.

I don't know what temp the ground water is in GA is but...