I have found the moisture absorbing containers for your closet to be helpful -- they sell them in the grocery store near the laundry detergent. One brand is Hippo, another is DampRid. When I first moved here, after about a month lots of stuff in the closets (clothes, shoes, luggage) was covered with white mildew-y spots. Now I use these moisture absorber things, and combined with the a/c, no more white spots. I only run the a/c at night in the 2 bedrooms that we occupy, and I will run it in the guest bedroom once every week or so. You have to replace the containers periodically.