Testing the accuracy of your residential wall thermostat is a straightforward diagnostic procedure that requires a reliable, independent digital thermometer. Start by placing the independent thermometer right next to your wall thermostat and leave it undisturbed for at least fifteen minutes to allow it to adjust to the ambient room temperature. Compare the temperature reading on the independent thermometer against the number displayed on your thermostat screen. If there is a discrepancy of more than one or two degrees, your thermostat may need calibration or cleaning. To troubleshoot further, remove the thermostat faceplate and gently brush away any accumulated dust inside the housing, as trapped dust can insulate the internal temperature sensor. You can verify that your thermostat is accurate when its reading matches the independent thermometer precisely or after applying an offset adjustment in your settings menu.
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