I keep hearing that this spring/summer more rain is predicted than last year totals. More rain also means more moisture that your home will be subjected too. Excessive amounts of moisture inside the home can cause mold growth and mold old growth can occur within 24 hours. Some preventive measures to heavy rain are to check your gutters for debris, make sure gutter down spouts are draining away from your home, and inspect the dehumidifier for proper operation if you have a basement.