Refrigerant enters the indoor coil far below freezing. As long as enough warm air passes over it, the coil stays above 32 degrees. Restrict the airflow or lower the refrigerant charge and the coil temperature drops until moisture in the air freezes on it, blocking airflow further. It snowballs.
Dirty filter, dirty evaporator coil, a failing blower motor, closed vents, collapsed flex duct, or undersized return ductwork.
A leak at a fitting, a coil or the line set. Refrigerant does not get used up, so low charge always means a leak that should be found and repaired, not just topped off.
Turn the system to off and the fan to on so the coil thaws. Replace the filter. Then have the system diagnosed. A frozen coil left alone can flood the compressor with liquid refrigerant and destroy it.
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