Thanks to past help from members on this forum with my severely oversized geo system I now have a system that is working well and efficiently for us. As we enter the main part of a new heating season I'm wondering about utilizing setbacks while we are away from home with an oversized system. I know that typically setbacks are not recommended however I have my aux heat turned off and my units set so they only use stage one of a two stage compressor. Even with those settings it only takes about 40 minutes of run time for a 2 degree temperature rise in the house. Thoughts anyone? Am I correct in assuming that one long runtime as the house comes back up to temp would not deplete the loop field anymore than several shorter run times during the day? Any other drawbacks I'm not thinking of if utilizing setbacks? Edit: Checked today's runtimes using my energy monitor and I am averaging 25 minute runtimes with 2 degree temp rise from my south unit and 35 minute runtimes with 2 degree temp rise from my north unit. This is with outside temps at 7 degrees today and two stage compressor running in 1st stage only.