Thermostat temperature reading is inaccurate compared to actual room temperature

Safety first: No high-voltage work is required.

Steps to correct inaccurate temperature readings:

• 1. Compare with reference: Place a reliable thermometer next to the thermostat and compare readings after 15–20 minutes.
• 2. Check location: Ensure the thermostat is not in direct sunlight, above electronics, or in a drafty hallway. If it is, consider relocating it to an interior wall in a representative area.
• 3. Seal wall opening: Remove the thermostat and seal the wall opening with foam or putty to prevent drafts from the wall cavity affecting the sensor.
• 4. Adjust offset: Use the thermostat's temperature calibration or offset setting to correct minor differences (1–3°F).
• 5. Replace thermostat or sensor: If readings are wildly inaccurate and cannot be corrected with offsets, the internal sensor may be failing. Replace the thermostat or use a Goodman remote indoor sensor if supported.