Now that the month is approaching that I will actually need to turn my heat back on, something like this is quite tempting. Granted our winters aren't half bad in Seattle, but still I wouldn't mind cutting my bill by a bit from now till next May or so when I can turn the heat back off again. What would really do the trick is probably having my ducts set up in at least two zones, one each for the upstairs and downstairs, and a more efficient furnace. But its hard to jump for a new furnace when ours is in good shape and isn't all that old.