troyh On the fourth week of november when they said that everything was working as it should for the fourth timemy loop temps were at 49.6 and that is with the geos working only a little because it wasnt really cold yet. But then we had a cold snap for the first two weeks in december where we were hitting teens and below. My lopp temps went from49.6 ewt to 36 ewt in two weeks. Then on d3ecember 23rd is when I had to install a new gas furnace. Like ive said before since I now have the gas furnace when it got down to 40 I just fired the gas furnace up and shut the main geo down. When it gets 40 or below we just are cold with the geos. I never thought of this but it is possible. I have a Ted energy monitor that will tell me exactly what my geos cost me to run. Before I go out of town this morning ill shut all electric down in my house and let everyon know what they cost.