I'm wondering if there is a typical run time for a properly designed geothermal heat system. I appreciate that there can be any number of variables involved but lets assume the system is properly sized, the house is super insulated and the outdoor temperature is -4 Farenheit and the desired indoor temp is 70 F. My system under these conditions has been running 10 of the past 12 hours. Everytime I looked it was in Stage 1. This doesn't seem normal to me. Thanks.