Sorry to resurrect an old thread but I'm having some issues in my basement. I was cleaning the other day and I noticed some discolored spots on my paint around 18" off the ground behind my couch. I checked around the room and it only seems to be happening behind things against one exterior wall. I just refinished the basement this past winter and it's the first I've seen this.

Normally the humidty in my basement is pretty lowat less than 50% @ about 66 degrees. I use the room as an exercise area too. When I'm finished my workout the room is up to about 61-63% humidity. I'm guessing the rapid change in temps is causing the cold air condensing. I took a microfiber towel and rubbed the area and the stain went away so it appeared to be just on the surface.

Does any one have any suggestions? Maybe run a dehumidifier while I exercise ? I tried running an oscillating fan today just to circulate the air, but humidity still got pretty high. I was thinking about some silica packets in the machines, but I don't want to remove all the moisture in the cab. Thoughts?