I have not realized the expected savings from geo and both my installer and manufacturer have tried to figure out why. They postulate that the radiant floor in the basement may the culprit. They point out two reasons for this: 1. not enough tubing in the slab 2. not enough insulation in the slab (this is obviously conjecture as no one has drilled through the slab.) My confusion with this theory is that when we were heating with propane, the basement was always the warmest room in the house in winter. With geo it still is. If there is not enough insulation in the slab, why would that affect the geo savings? By this I mean, it was the same slab that presumably was sucking out energy with propane so wouldn't the same BTUs be required to heat our slab with geo at a much more efficient COP? So basically I would love feedback on this theory and my rationale (or lack of it!) I think the forum is a fantastic resource and I'd love to join the bandwagon of happy geo customers so any help would be appreciated.