During summer, when it’s hotter outside than inside, high humidity in a crawl space is common. Condensation forms as warm, damp air infiltrates your chilly crawl area.
This is because cold air cannot store as much moisture as warm air, causing humidity to rise. Leaking pipes or a lack of insulation in your crawl space can contribute to high humidity levels.
Crawl space dehumidifiers are more compact due to the limited space. A more powerful fan is also required for crawl space dehumidifiers. This guarantees that dry air travels around narrow places and corners.
For these reasons, if you’re going to use a dehumidifier in your crawl space, make sure you choose the right one.
When placing a dehumidifier in a crawl area, make sure it is in the right place. You want to make sure the dehumidifier has the most surface area to exchange air with.
Using a fan to circulate air around your crawl space may be helpful. Moving air around in confined spaces helps with dehumidification.
If your dehumidifier does not have a continuous drain, you will need to empty the tank. If you’re collecting water in your dehumidifier’s tank, make sure it’s accessible. 
Emptying a dehumidifier tank is a pain, so consider one with a drain hose or pump. Hook up the hose and your dehumidifier will drain on an ongoing basis.