I live in North Florida in a house I built about 45 years ago. Understandably because of my location ( in the woods next to a swampy area) I have always had a problem with the humidity here. Every summer mold and mildew quickly grow on my furniture, clothes, etc.... There is invariably a musty odor in the house. I have learned to live with it and it really doesn't bother me... I know that if I used an air conditioner or a dehumidifier that I could control it but I prefer not to as I want to keep my electric bills low (they generally run about $20/month). How I manage to stay quite cool during the summer is by opening all the doors and windows at night and then closing them up during the day. Recently I began thinking about what might lessen my mildew problem.. When I built this house I just used concrete block construction on a slab with no interior drywall... I even made my interior walls and kitchen cabinets out of concrete block. I actually like the look of it and certainly liked the simplicity and cost of it. (termite, fire and moisture proof.) I live in a flood plain where I might be subject to about a foot high of flooding every 50 years or so.. The thought that all I really would have to do if that ever happens (it hasn't yet) is just wash the place out with no damage to the walls or slab floor. I recently helped a friend nearby whose house was flooded tear out ruined drywall, flooring, insulation,.. etc... a real nightmare!!!)... Back to the mildew,... I have been wondering whether my lack of drywall is contributing to the mildew problem.. What made me think that is the name of it ..., drywall..., Why is it called that.. Does it serve as a moisture barrier? Does it keep moisture from condensing on the colder cement blocks? There is no stucco or paint on my blocks and I poured styrofoam pellets into the voids within the blocks as insulation but I suspect that moisture and humidity must flow pretty freely into and through the blocks... Would it make any difference to paint of stucco them.?.. I can't imagine it would do much to keep the humidity down as i open all the doors and windows every night... Just some thoughts,... I wonder how those of you who live in humid areas manage,... and how you do it without air conditioning???