I lived in S. Florida, too for 5 years. One of the tricks we were told to prevent mold was to never completely shut any door in your house, like closets, doors between rooms, even when the AC was on.
I am really not sure which was worse the "dry" heat at 112 degrees, or the 90 degree, 90 percent humidity. All I know is that when people complain about the winter here, I just smile.