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Add a sensor not a thermostat, also one tenth of the price. Then on the app you can see the temperature on both levels and adjust the registers so that you get an even heat across your home. Or set the app to choose which room is in charge of the temperature at what times of the day.
Sorry, there was a problem. Please try again later.Please note that you are not able to control one Nest Learning Thermostat with another. If you were to have two Nest Thermostats in your home they would either control their own equipment or control the same equipment if you have a zoned system. https://nest.com/support/article/Does-Nest-work-with-zoned-systems
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