If you suspect or are told there is a moisture problem in your crawlspace, make sure that wood-moisture levels are measured with a meter. The readings need to be collected from areas throughout the crawlspace to get a better picture of overall conditions. Steps like this taken by a pest control company reflect reputability.
A moisture meter pressed into a floor joist.

M. Waldvogel - NCSU - Entomology & Plant Pathology