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~40 - 45 F for many hundreds of feet down and the well drillers here are greedy as all get out.Curious as I have not checked geo data in your area but can you not just go deeper for a good geo loop? What is the ground water temp on average?
Also, IIRC, the wind blows there? I guess if you have other heat sources, wind might be too costly but that can work well to simply dump all wind genny heat to a resistive heater for radiant heating.
The wind tears all but the most over built wind generators to bits here.
I've played with the AE stuff all my life and when it comes to the energy levels needed for winter heating the numbers for most AE based energy sources don't pan out favorably. Direct solar thermal capture dumped directly into the ground loop is the only thing I have found that ever worked out by the numbers as being plausible but even then the winter time electrical power consumption to run the heat pumps itself still adds up to being less favorable than burning wood coal or used oil.
It will work if you don't mind having a cold wet slimy floor all summer. You will have a hard time keeping your floor surface temperature at a level that's good enough to provide cooling effects but not produce condensation everytime the weather and local humidity levels change.I also plan to cool the slab in summer too. I hate to use the term "radiant cooling" because we know that won't really work but I want to remove extra heat gained by the slab from surrounding hot soil. I have learned that the slab can get to 90*. Just getting that back closer to dew point should significantly reduce cooling loads.