Curt Raymond via Mercedes wrote:
I was under the impression that geothermal was intended for places where it was 
cold in winter where an air source heat pump was fine in places where it didn't 
get too cold. I'm also disappointed to find out that the supplemental heat has 
to come on at 10F with geothermal. I was under the impression that 300' down 
the temp was pretty steady. Is it because OK is so dry that there is trouble 
shedding cold down there?

In OK, design temp for heating systems is probably 10°.
It runs around 0-3°F here in south-central Michigan.

Mitch.

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