Since a crawl space is one of the moistest areas in a home, getting rid of that excess moisture will go a long way towards reducing mold and mildew from sprouting up in the rest of your house. That is not to say that it will completely solve all of your moisture issues.
If you do want to try and get rid of moisture throughout your home, then you need to make sure that you get a model with not only an extremely high-performance level but also one with a large coverage area. That way, you can help to eliminate moisture throughout your entire home, which will help to get rid of mold and mildew.