Why it matters to you
In a humid Charleston summer the evaporator coil is doing heavy dehumidification work every day. Low airflow from a clogged filter or a low refrigerant charge can drop it below freezing, turning it into a block of ice.
Practical guidance
Change filters on schedule and keep supply and return vents open. If you see ice on the indoor unit or refrigerant lines, switch the system to fan-only or off and call for service rather than chipping at the ice.
