A residential wall thermostat can read the wrong indoor temperature due to several common sensor and environmental issues. One of the most frequent causes is accumulated dust and dirt inside the thermostat housing, which acts as an insulating blanket around the internal temperature sensor and prevents it from measuring ambient air accurately. Another common culprit is poor thermostat placement, such as being mounted on an exterior drafty wall, near a heat-producing appliance, or in direct sunlight. Additionally, internal electronic calibration drift over years of use can skew readings. You can troubleshoot by removing the faceplate, cleaning out dust with a soft brush, and checking for environmental heat sources. You can verify that the temperature reading has been corrected when the thermostat display matches a trusted standalone room thermometer.
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