The Honeywell TB8575A1000 24Vunivfancoilstat3Spdfan is a digital thermostat intended for use with fan coils. These components are found in HVAC systems heating, ventilation, and air conditioning that regulate temperature with hot or cooled water. Since the thermostat is universal, it can be used with single-stage, two-stage, and variable-speed fan coil units, among other types of fan ... https://www.partshnc.com/24vunivfancoilstat3spdfan-2