The Peco Controls TA155-017 On/Off 24-277V 3Spd Vert. Stat is a versatile vertical thermostat that is intended to efficiently control HVAC systems. This thermostat operates on a voltage range of 24 to 277 volts and has three-speed fan control, allowing for precise temperature regulation and airflow management. https://www.partshnc.com/ta155-017-peco-controls-onoff-24-277v-3spd-vert-stat