The Trane TCONT103AN21HA is a non-programmable digital thermostat designed to control heat pump HVAC systems with up to two heating stages and one cooling stage. It monitors indoor temperature and signals the heating or cooling equipment to maintain the selected comfort level. Suitable for compatible residential and light commercial heat pump applications, it provides Heat, Cool, Emer... https://www.partshnc.com/tcont103an21ha-trane-2ht1cl-heatpump-thermostat