I have a 1.5 HP 220 V single phase deep well pump - but I am also watering livestock and my water table is down almost 70 feet. If I recall, your water table is much higher.
My well pump is supplied by my solar panels.
Why not just put PVC supply tubes for HVAC under slab? That way, you don't have to use hot attic for supply ducts.
You have time to decide on MS vs GTHP.
Steve
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consulting on geothermal heating/cooling & rational energy use since 1990
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