The outside air that you bring into the crawl actually has more moisture in it than the crawl space air you’re venting to the outside much of the time. Vent the crawl space to the outsideĭo this in a humid climate, and you’re asking for trouble. Let’s take a look at each of these methods.
Using an exhaust fan to move air from the crawl space to outside. Putting a little bit of supply air from the HVAC system into the crawl space. The tried and false method of venting the crawl space to the outdoors. So, as always, do what’s most suitable for your climate.īasically, your options are to do one of the following: In a dry climate, it may or not be worth the cost to encapsulate. But what do you do about the air down there?īefore we address that question, however, let me point out that encapsulated crawl spaces are great for humid climates, like the Southeastern US. It’s often seen as the best way to eliminate the moisture problems that often result from vented crawl spaces. Most crawl spaces are vented to the outdoors, but over the past decade, encapsulating the crawl space (as shown below) has gained favor among builders of green and energy efficient homes. 
If you have a home with a crawl space-or are building or buying one-you have several options on what to do with that particular foundation type.
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