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I have 3 zone in my house basement, main level, and bedrooms. Each floor has its own thermostat to open the valves in my hot water radiators. I also have another thermostat to control my A/C unit located in the attic. I would like to switch to a smart thermostat so I can monitor the heat and cold when I'm not home. Will I need to replace all 4 thermostats in my house. I'm looking to use just one that could control each floor and A/C if possible.