The answer to 'air duct sealing freezing up' is that this issue is often caused by a problem with the HVAC system's airflow. When the air ducts are improperly sealed, it can lead to cold air leaking into the system, causing the coils to freeze up. This can result in reduced airflow, poor heating and cooling performance, and even system damage.
Some common symptoms of this problem include ice buildup on the coils, reduced airflow from the vents, and higher-than-normal energy bills. To address this issue, you may need to have the air ducts properly sealed by a professional HVAC technician. Proper duct sealing can improve the efficiency of your HVAC system and prevent future freezing issues.