If using the Celsius or Fahrenheit temperature display for your heater, the temperature on your GEN2 heater may vary from the temperature display on another thermostat, such as the one on your wall. The temperature sensor on your heater reads the temperature in and around the heater. If your unit is near a cold floor, the display will register a cooler temperature than an elevated, wall mounted thermostat. This is because heat rises. The best way to operate your heater is to just set it to a temperature that feels comfortable to you.