MRCOOL MST06 Smart Thermostat is an HVAC controller designed to provide convenient temperature management for compatible MRCOOL heating and cooling systems. It works by monitoring indoor temperature and sending control signals to the connected HVAC equipment, allowing the system to adjust heating or cooling to maintain the selected setting. Designed for use with compatible MRCOOL duct... https://www.partshnc.com/mrcool-accessories-smart-thermostat-mst06