If you could do your own Air Conditioning Repair this would not happen to you

Fixing air conditioning vent is a breeze
June 22, 2008

Q. I am getting a lot of condensation around two of the air conditioning vents coming out of my cathedral ceiling. No other vents in the house do this. It is enough to wet the plasterboard around the vent, causing it to decay. What is wrong and how can I fix it? The air conditioning man said the duct is not laying flat and after that we caulked, but the problem continues.

SLIDELL, Louisiana

A. Air conditioners are not supposed to do that, because they are dehumidifiers as well as coolers. I think what is happening is that both the ducts coming out of the cathedral ceiling - and the ceiling - are not insulated, and the cool air coming out of the vents condenses in the cool sides of the ducts just as it comes out of the ducts. Insulate the space between the ceiling and roof, being careful to ventilate the space above the insulation. And, insulate the ducts, or install pre-insulated ducts.