Inspired by the The Round, Honeywell’s 1953 T86 thermostat that’s currently in the Smithsonian Museum, the M5 Classic Smart Thermostat is a whole lot smarter. It can not only control your heating and cooling intelligently, but it also acts as a central point for all your home’s systems—it can help monitor and manage air quality, detect water leaks, and monitor energy use and security when paired with other Resideo products.