We were called to this basement because the walls were sweating and the carpets were even damp to the touch. A little investigative work discovered the clothes dryer vent had become disconnected and fallen behind the wall. This was a double whammy....It was letting hot/humid air into the home, and blowing the hot/humid air from the dryer behind the walls which was making them sweat! We replaced the dryer vent and tah-da! A dry, comfortable basement... Problem solved for under $300!