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Hopefully somebody will come along and be able to give you more specific numbers and such, but I'm pretty sure that it will help by keeping things like mold/mildew and other smells out from your home. It will most likely reduce your power bill a bit as well.
Do a search on here using keywords KL K & crawlspace and you will see a couple of good discussions that will help get you started. A general search using "crawlspace" will pop several more. As Dan said, suspect you will get several comments from our other contributors on your post as well... Tim