Although the temperature readings from the factory are normally accurate, if you find your thermostat is not reading the correct ambient room temperature, please follow this guide or check the user manual.

1. Make sure the hole in the wall through which the wires are fed is properly insulated and/or the gasket is properly installed.
2. Press and hold the Program button, tap Time/Sensor to enter Temperature Calibration Mode.
3. Tap Mode to step between temperature calibration and humidity calibration. Temperature Calibration •  The top left number (77 in example) is the current reading according to the temperature sensor. •  The top right number (14 in example) is the current offset (represents 1.4).
4. These numbers can change while this screen is displayed even though the primary temperature does not change. They are floating point calculations.
5. Tap Up or Down arrows to adjust the displayed temperature to match the calibrated source. i.  Each press results in a 1° F (0.5° C) change. ii.  The calculation using example numbers below is 78 = 77 + 1.4. iii.  The offset range is from –10 to +10 actual degrees. 

Note: Use a calibrated temperature or humidity source when adjusting INSTEON Thermostat