During the recent one year, I have noticed my dryer is producing condensation and wet inside when it is not in use. I live in a 5 units apartment building and I am on the top floor. After I cleaned the dryer duct, it still has this problem. I almost feel the hot air comes from my neighbors' apartment and somehow it gets into my dyer when they are laundering.
Maybe the fan getting hot air out of the building for the building common duct is not working? How to identify? What type of contractors should I hire to check this issue?
Any advice is appreciated!