I don't have any experience with geo systems, but I tried a Nest with my conventional gas/electric system, and I didn't like it. See my comparative review of the Nest vs. the Honeywell RTH9580...
Type: Posts; User: TennesseePhil
Search: Search took 0.00 seconds.
Results 1 to 3 of 3
Used Equipment - Buy, Sell, Save!