The T651A3018 Honeywell medium duty, line voltage thermostat is the perfect way to provide direct, accurate control of inductively-rated heating, ventilating, or cooling equipment used in commercial or industrial environments! THE DELUXE STYLIING IS DESIGNED FPR COMMERCIAL BUILDINGS!Altitude compensation along with the high-sensitivity vapor-filled stainless steel dual diaphragm sensing element equals an excellent product. UL listed and CSA certified, with the purchase of the T651A3018 you know you are getting an efficient and accurate Honeywell thermostat. Choose your T651A Honeywell thermostat this season.