Just purchased a home built in 1993. Made my first inspection of the crawl space and some of the floor AC vents have condensation on the underside of sub-floor. Enough to the point that it is discoloring the plywood. May even have some mold starting to grow. Insulation looks to fine and in-tack. But pretty damp none the less. We live in the HOT and very humid state of SC. Is there a fix for this short of having duct work re-worked? By the way, Temperature has been in low 90's for several weeks now and humidity around 90%.