Originally Posted By: DWallach
(N.B.: if you really and truly want this feature, make sure you root through the whole Honeywell line to make sure the one you get actually does have this feature. The link above may or may not actually have it...)

I was just looking at this — I've been meaning to get one of these for ages — and it turns out that despite the fact that the Honeywell web site claims that the RTH6350D model has this feature ("Auto change from heat to cool"), it does not.
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Bitt Faulk