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The loops are vertical closed (3x250'), using a chemical heat transfer fluid. I don't know the EWT, but understand it to be no higher than 50F. The same company also did an energy audit of my home...

Thanks for quick reply. I tried 345 and 346 at 0 last night, along with setback, but the aux heat kicked on anyway. Outside temp was around 30F. Am I missing something?

I'm the new owner of a residential geothermal HVAC system and have encountered some troubling surprises concerning the way the system uses the aux (gas) heat. First, I learned that using the...