Ok, y'all...need your opinions again. First full winter with the geothermal (closed pond loops). We had the maintenance man come out and check the settings (he has to make some calls and get back to us, been two weeks). One thing I'm still not sure of, when should 'heat strips' come on? Any of you know? This last week it's bee minuses and low one digit and even though we have the thermostat at 72; it shows 63 and we do believe the heat strips are kicking in a lot (as we notice the lights dim). Any of you with geothermal have gone thru this??? I know its pretty complicated settings etc. Bottomline, the house is warm and my electric bill is only running about $30 more a month because of the geothermal unit.