Thermostat temperature reading is inaccurate compared to actual room temperature

Safety: Only low-voltage work is involved; turn off power if removing the thermostat from the wall.

• Compare with reliable thermometer: Place a digital thermometer near the thermostat and compare readings after 15–20 minutes.
• Adjust calibration: In thermostat settings, use the temperature offset or calibration feature to correct minor differences (e.g., ±2°F).
• Seal wall opening: Remove the thermostat and use foam or putty to seal the hole in the wall behind it to prevent drafts from affecting the sensor.
• Relocate thermostat: If installed near windows, exterior walls, or supply vents, consider relocating to an interior wall in a representative area. This is best done by a technician.

Note: If readings are wildly inaccurate even in a good location, the internal sensor may be failing and the thermostat should be replaced.