Jay Stootzmann wrote:

http://www.advancedenergy.org/buildi.../crawl_spaces/

As Advance Energy showed in their field studies I think the only alternative
to a active dehumidifier is to have a supply vent from your HVAC system into
the crawl space [but NO return vent]

Why would you think that? A SmartVent(.net) would be another alternative.

Nick