This will be my first winter with my ground source system, a Climatemaster instead of Waterfurnace. My ground loop is 6' deep, there are 4 trenches 300' long and each one has a pipe down to the end and back for a total of 2,400 feet of pipe.

It is only starting to cool down, but so far so good. I'm very interested to see how it does when the highs are in the 30's and the lows are below freezing.

I did the savings calculator on that site and it said it will cost me more than my current system? I thought there would be cost savings from this? Does it assume I have an AC unit already?