The ClimateMaster 24291503 Thermostat is a temperature control device designed for compatible ClimateMaster HVAC systems, including geothermal heat pumps and related indoor comfort equipment. It monitors room temperature and communicates with the HVAC system to activate heating or cooling as needed, maintaining the selected comfort level. This thermostat provides convenient temperatur... https://www.partshnc.com/24291503-climatemaster-thermostat