Today during a residential service call in McDonough, we found what looked like a heat pump system with low Freon. After checking the air flow, it was determined that the coil was blocked. It was the worst we ever saw. The renter had put a tee shirt down the return. There was never a filter. The coil had dog hair and poo clogging it. Most of this was done on purpose. A clogged coil can block the air flow and freeze the lines. This is the same outcome a unit low on refrigerant has. You will have no cool air and the black line going into the a/c will be frozen. The ice you can't see is the problem. It was a solid block of ice in the air handler under the house. You can damage the blower motor so turn it off if you see ice. The coil was cleaned, and it is all working now. Aaac Service heating and air 7708754113
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