Humidistat Fan or Dehumidifier for Damp Crawlspace?

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I live in Nashville, where it's quite humid.  I moved into my first house last August and we have a stand-up crawlspace.  Around the exterior of the crawlspace, the builder put in four vents.  About a month after moving in, we started to see what looked like mildew and/or mold growing on the walls of the crawlspace.  I had a "mold guy"  come in and he recommended a dehumidifier.  I had a friend of mine who knows quite a bit about DIY stuff come to my house and he recommended getting a humidistat fan instead.  Before I rush out and buy one and put one in, what do I need to know about using humidistat fans?  Are there certain factors that make them uneffective that I need to be aware of?

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