Fixing a wall thermostat that reads the wrong indoor temperature involves addressing dust accumulation, sensor calibration drift, or improper wall placement. First, remove the thermostat faceplate from the wall mounting bracket and gently clean out any accumulated dust, dirt, or insect debris inside the housing using a soft brush or compressed air, as trapped dust acts as an insulating blanket around the temperature sensor. Second, check your thermostat's on-screen settings menu for a temperature calibration or offset feature, which allows you to manually adjust the reading up or down by a few degrees to match a trusted standalone thermometer placed nearby. Third, ensure the thermostat is not mounted near drafty windows, exterior doors, or heat sources. You can verify that the fix was successful when the thermostat display matches actual room temperature accurately.
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