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Window Air Conditioner Sweats

This sweating causes moisture in the window sill and the wall, which in turn causes rotting of the wood. How do I stop the sweat?

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You need to seal the portion of the air conditioner that is inside the window from the portion that is outside the window, Sweating is caused by moist outside air leaking in and contacting the cold portion of the air conditioner. Do not use duct tape, buy aluminum tape which is what professionals use to seal air leaks on ducts. Home Depot sells the tape. Buy the smallest quantity you can find that will do the job ( it can be expensive ) unless you plan to go into air conditioning duct installation.

For best results use some form of insulation over the accordian like side baffles ( cut to fit) . Styrafoam from packaging or silver backed insulboard (Home Depot). Now tape the sides of the insulation to all sides of the window frame, bottom of the window, the sill, and the air conditioner.

Unless you enjoy doing this every year - plan on this being a permanent installation. It is a tedious job because the aluminum tape is not very forgiving and has a peel off backing but it sticks forever.

Posted on May 08, 2008

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