How do I recalibrate my thermostat?

Recalibrating a residential wall thermostat to ensure it matches actual indoor room temperatures requires accessing the device's internal software settings or service menu. First, place a reliable, independent digital thermometer right next to your wall thermostat and leave it there for fifteen minutes to establish an accurate baseline room temperature reading. Second, compare the thermometer reading against what your thermostat screen displays. Third, access your thermostat's menu, navigate to the settings, preferences, or advanced configuration section, and look for the "Temperature Calibration" or "Offset" option. Fourth, use the on-screen arrows to adjust the thermostat's internal reading up or down so that it matches your reference thermometer exactly, and save the changes. You can verify that the recalibration was successful when the thermostat displays the correct room temperature and triggers your HVAC system accurately.