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This will help aid the defrost of an icy evaporator coil and the rest of the frozen air conditioning unit. As more air is pushed into the coil, it will warm up, and the ice should start melting. Letting the Cold Inside...Winter Home Ventilation As Tip #2 do not run your ac in the winter. How to unfreeze an air conditioner in winter . We'd had a rainstorm overnight, and while the temperature. However, you can still thaw out the air conditioner by turning your thermostat off and leaving the fan on at average speed. Check the vent filters to see if they are clogged and restricting air flow. Do not tape the cord to the back of the unit where the coils are. Then just wait and let the ice thaw. First know that this will take a few hours. About a week ago, we awoke to a horrible grinding sound coming from our outside compressor unit for our heating system. Heat pumps are designed to pull cold air from a home and not freeze up. Switch off your thermostat and turn on yo...