The Emerson Climate Technologies White Rodgers 1E78-144 is a non-programmable, vertical digital thermostat designed for precise temperature control in single-stage heating and cooling systems. Operating on 24V, it is compatible with conventional HVAC equipment such as gas, oil, and electric furnaces and air conditioners. https://www.partshnc.com/1e78-144-emerson-climate-white-rodgers-vert24v-htcl-nonprogdig-batt