Properly encapsulating your crawl space with a dehumidifier and, if necessary, interior foundation drainage and sump pump will make the structure more durable. Sealing the crawl space keeps out moisture, by controlling relative humidity we are helping prevent mold from growing. Along with installing a dehumidifier, we can control relative humidity, by doing this, we can help ensure a clean, healthy, dry, and temperate crawl space. This results in better indoor air quality and a more comfortable home.