The answer to 'why is my thermostat freezing up' is that a frozen thermostat is usually caused by a problem with the HVAC system, such as a refrigerant leak or airflow issue. This can lead to the thermostat's temperature sensor freezing, causing it to malfunction and display inaccurate readings.
Some common symptoms of a frozen thermostat include the display showing an unusually low temperature, the HVAC system running constantly, and the thermostat's internal components becoming covered in ice or frost. The solution may involve adjusting the thermostat settings, checking for airflow blockages, or having a professional HVAC technician diagnose and repair any underlying issues with the HVAC system.