i live in an old house, the oldest half of the basement has clay walls, so i always had seapage,,, when it rains, i have water flowing in channels built into the floor.. since i put my ap system down there, it actually dries out quicker, and is less humid than before i put 1300 gallons of water down there.. the only time i've had any humidity is in the summer, when we have high humidity outside..a small fan recirculating the air helped that