Many homes built on crawl space foundations in the Southeastern United States suffer from poor moisture management. Often, heating & air conditioning contractors, as well as pest control companies, are the first people to alert residents to contact a moisture control professional . Typically though, the problem is not due to a failure of the air conditioning system; it results from poor moisture control in the crawl space.
For many decades, building codes and conventional wisdom have prescribed ventilation with outside air as the primary method of moisture control in crawl spaces. In the humid Southeast however, ventilation with outside air only makes moisture problems worse. Recent research indicates that by sealing off all outside air that enters the crawl space, and regulating the humidity underneath, you can provide greatly improved moisture control and significant energy savings when properly installed.