The best solution for a crawlspace is to total encapsulation however there are some exceptions. Basically pool liner over the floor and just up the walls and foam insulation around the perimeter walls and piers. Lots of good info over at building science site.
I have about 90% of the floor covered and closed off the vents and monitored humidity and it does make a difference in heating and cooling. The floors used to be noticeably warmer in the winter and cooler in the summer with the vents closed.
If we end up with another pier and beam house in NC when we move it will be part of the negotiation that it has the crawlspace encapsulated or knock off $ and I will have it done. I'm not doing another one myself...
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