The absolute fastest and safest way to thaw a frozen air conditioner coil is to turn your indoor thermostat mode to "Off" and switch the blower fan setting from "Auto" to "On." This forces the indoor blower motor to continuously circulate warm, room-temperature air across the freezing metal evaporator coils, melting the ice rapidly from the inside out over a 3 to 6 hour window. Never attempt to use a heat gun, hair dryer, or pour boiling water on the coils, as extreme thermal shock will crack fragile copper refrigerant lines and destroy the equipment. Verification: Check that condensation begins draining steadily into the indoor drain pan as the ice melts.
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