Adding a dehumidifier to your crawlspace will maintain
a low relative humidity which is desirable for controlling mold growth. Crawlspace dehumidifiers can be set up to drain directly into a sump basin or straight to the home exterior. If you want clean and dry air inside your living space, you must start with a clean and dry crawlspace. Before installing a crawlspace dehumidifier, the area must be properly sealed and isolated from outside air.