The Honeywell Home horizontal digital non-programmable thermostat provides simple control over your heating and cooling system. Simply set your preferred temperature on an easily accessible and user friendly interface. Advanced temperature monitoring minimizes temperature swings and ensures absolute comfort. In the event of a power outage, the RTH111B will also remember your previous temperature settings. This thermostat features a broad compatibility range that covers single-stage heating/cooling systems, heating, cooling, heat pumps without backup heat, mill volt, pellet stoves and fireplaces.