Why is the HVAC condenser icing over on really cold days?

The HVAC condenser can ice over on really cold days due to low outdoor temperatures causing the refrigerant in the condenser to become too cold, leading to condensation freezing on the coils. Additionally, inadequate airflow, such as from dirty filters or blocked vents, can prevent proper heat exchange, exacerbating the icing issue. If the unit is running continuously without adequate defrost cycles, the ice buildup can further impair efficiency and performance. Regular maintenance and ensuring proper airflow can help mitigate this problem.