Can more than one Smart Thermostat be installed in the same system? 11 April 2025 10:33 Updated Of course, up to 15 Smart Thermostats can be added within the same system. Related articles Can I change time slots or room settings with the Smart Thermostat? Differences between Smart Thermostat and Starter Installation and configuration of the Smart Thermostat Installing the Smart Thermostat How is the Smart Thermostat powered?