Orbit Clear Comfort Non-Programmable 83501 Thermostat Display is Large Enough to be Easily Read from Across the Room Transparent Polycarbonate Faceplate with Straight-Forward, Easy-to-Use Buttons to Manually Adjust the Temperature Up or Down Accurate Temperature Reading to +/- 1 Degree F for Ultimate Consistent Control Designed with Style in Mind to Enhance the Dcor of Any Room Perfect for New Installation or Replacement Universal Replacement- Replaces thermostats for 1-stage gas furnaces with electric or gas fan, 1-stage oil systems, 1-stage heat pumps, and 1-stage cooling systems Not compatible with base board heaters (or other line voltage heating), multi-stage heating or cooling systems, or 3-wire hydronic systems