Why Is My Air Conditioner Leaking Into The House?

Air conditioners in the US no longer use the drain hole method of eliminating water that condenses on the evaporator. Instead, all manufacturers are building air conditioners that collect the condensed water in a pan, usually at the bottom of the unit, and spray the water on the condenser and compressor as a fine mist. The mist evaporates, cooling the condenser and compressor and improving the air conditioner's cooling efficiency. The pans are built to retain a certain quantity of water and have a lowered portion on the outer back edge so that excess water can drain out the back of the unit. However, the air conditioner needs to be installed with a slight (about 5 degree or 1/4 inch) backwards pitch for the draining to work properly. If your air conditioner is dripping or leaking into the house, chances are that it is not pitched backwards enough and excess water is draining out the front or side of the air conditioner. To increase the backwards pitch, carefully unscrew the screws that hold the air conditioner in place, reset the air conditioner so that it has a slight backwards tilt, and then re-attach and tighten the screws.

    If you are having trouble getting the air conditioner to tilt back slightly, you can try sliding quarter inch shims under the front edges of the air conditioner.  

    This is a two person job. Air conditioners are heavy and we recommend that you get a second person to help you hold the air conditioner in place when you unscrew the screws and when you move the air conditioner to reset it.  

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