The answer to 'why is my central air freezing up' is that a frozen air conditioner coil is a common issue caused by airflow problems, refrigerant leaks, or other malfunctions. This can lead to the coil icing over, restricting airflow and causing the system to freeze up.
Some common symptoms of a frozen AC coil include reduced airflow from the vents, the unit running constantly without cooling properly, and visible ice buildup on the coil. Causes can include a dirty air filter restricting airflow, low refrigerant levels due to a leak, a malfunctioning blower fan, or other mechanical issues. Homeowners may be able to temporarily fix a frozen coil by turning off the unit, clearing the ice, and checking the air filter, but persistent freezing usually requires professional HVAC service to properly diagnose and repair the underlying problem.