Specifically if your trane furnace is a modulating system which I think it is with that price tag, then it will not work as a modulating furnace. It will operate it as a two stage system. Nest does not have a modulating thermostat yet. Does your old thermostat run a humidifier or just report humidity level in your home? If your old thermostat runs your humidifier then nest will not run it as of yet. You'll have to install a humidistat in your cold air return duct until nest releases one if you choose to go with the nest. I think you would be better off waiting.
Curiously how long will it take to get your $10,000 back in savings on your upgraded system? I guessing a real long time.
Modulating and controls humidifier, so no go at the moment. I assume updates to the firmware/OS would/may add those features?
Calculated savings, $8,500 with the $1500 rebate, about 3 years (had a York system before when we built the house 8 years ago, was terrible). We have some of the highest G&E prices in the northeast, we've already seen ~25-30% drop in overall monthly costs. The SEER was calculated at 18-19, A/C uses R-410a as R-22 is (of course) illegal since 2010.
(watched the video and learned it is a full thermostat replacement, would be interesting as an addition to your home for use in other rooms but I suppose an iDevice would be utilized as a remote controller)
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