The key to mold control is moisture control. If mold is a problem in your home, clean up the mold promptly and fix the water problem. It is important to dry water-damaged areas and items within 24 to 48 hours to prevent mold growth. Also, high humidity in a basement is a common culprit for mold growth. This occurs when the AC is turned off and basements get very hot/humid or if a naturally damp basement does not have a dehumidifier installed and running during the summer months.