I don't it is possible to install a Basement Dehumidifier in the crawl space or if it can actually reach unto that place to eliminate molds and damp air. But, there are still other things to do to prevent damp air, how about sealing it with plastic vapor barrier? i don't know how much it costs but at least you can protect your home and as well as the air you breathe. newbielink:http://www.computerseo.com/ [nonactive]