The Big Freeze: Why Is Your WIndow Air Conditioner Freezing Up & How Can You Fix It?
Window-mounted air conditioners are extremely useful devices, providing efficient cooling power during the hottest summer months at a fraction of the price of a full-blown ducted air conditioning system. However, window air conditioners are as vulnerable to occasional mechanical malfunctions as any other kind of air conditioning system, and one of the most commonly encountered problems is ice buildup.
A few spots of ice accumulating around the edges of your window air conditioner's vent generally aren't much to be worried about, but more significant freezing problems can be a more serious matter.