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Multi-"zone" without dampers
I have a basic single zone gas+AC forced air system in my 2-story home. We spend the days on the first floor, and nights in the bedrooms on the second. I have the idea of controlling the temperature measurement from downstairs during the day, and upstairs during the night after we go to bed. I don't want to go through the trouble and expense of adding dampers to the existing duct work, but I should think controlling the system based on where the people are would make us more comfortable and the system more efficient.
I haven't been able to find any thermostats that accept a second temperature input, that you can program when the different thermocouples are active (I have seen some that take the average of the tempreatures).
Any products out there fit the bill? Any feedback on the idea?