Identifying whether your central air conditioning system has frozen up inside your house involves observing several distinct physical and performance warning signs. Major indicators include a sudden and complete cessation of cool air blowing from your indoor supply vents, ice crystals or thick frost visibly coating the insulated copper suction line running into your indoor air handler, water pooling on the floor around the base of the indoor unit as melted ice overflows the drain pan, and a system that runs continuously without ever satisfying the thermostat setting. Verification: Open your indoor air handler access panel or inspect the copper lines near the furnace to check for visible frost or ice.
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