The Carrier 33TCSPL-4 Connect Plus Thermostat is a digital temperature control designed for compatible Carrier HVAC systems. It monitors indoor temperature and communicates with the heating and cooling equipment to maintain the selected comfort level. Commonly used with furnaces, air conditioners, heat pumps, and packaged HVAC units, it helps manage system operation accurately and eff... https://www.partshnc.com/carrier-33tcspl-4-connect-plus-thermostat