If you have ducts in your house/office, you’ve probably noticed that wherever the ducts poke out of the wall/ceiling/floor they are covered by a grate. Most of the grates have a little lever on the side that lets you close them off, but at least one grate cannot be closed. These grates that are always open are called “returns.” The AC unit needs a steady supply of air to work properly, and it sucks this air in through the returns. Thus, if you block the returns you will starve the AC of air and the evaporator will eventually get so cold it starts to freeze. The average air conditioner repair costs $400, with an additional service call fee of around $150. Repair prices can range anywhere from $5 to $3,300 depending on the type of repair, labor and how long it takes to repair the air conditioner.
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