The Rheem-Ruud 1HD-12987.5/2 High Definition Communication Thermostat is a precision-engineered control device designed for seamless integration with Rheem and Ruud communicating HVAC systems, including air conditioners, heat pumps, and furnaces. https://www.partshnc.com/1hd-1298-rheem-ruud-752-comm-hd-thermostat