The only effective way you can reduce Humidity in the indoor environment is to have a dedicated system and to make sure that you have control of the “Gaps, Cracks, & Holes” in your building. There are times during the year that we experts call “the shoulder season”; the time when there is plenty of humidity but it’s not warm enough to run the A/C system. This is when its cool, clammy, and even wet enough to sustain mold growth.