Checking your indoor air conditioning evaporator coils for ice accumulation requires a safe visual inspection. Step 1: Turn off the system at the thermostat to ensure safety. Step 2: Locate your indoor air handler closet, furnace compartment, or attic unit. Step 3: Remove the metal access panel or filter door leading to the evaporator coil housing, using a screwdriver if necessary. Step 4: Look inside with a flashlight; a frozen coil will appear encased in white frost or a solid block of ice, and the thick copper suction line outside will be frosted over. Verification: Shine a light inside the coil cabinet to confirm whether ice crystals are present.
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