Sorry, inside joke. To answer the only question I saw here, play with the settings until the fans only run if there's water in the crawler. If the crawl is dry, then there isn't any point to running it. It may just be a humid day.
Your crawl should have a layer of 6mil builder's plastic covering the entire crawl floor. The seams should overlap by at least 8", and the plastic should stop without going up the sides of any piers posts pilings or footings. There should be NO unnecessary celulose (wood paper etc) under the house. There should be at least 6" between ANY soil and wood combination.
All of your joist bays should be insulated, all loose batts should be reinstalled. Make sure all vents are properly screened (1/8" or smaller) and that none of them are blocked by insulation.
Check your heat lines while you're down there and make sure none of your little rodent friends haven't been building neighborhoods in the insulation. A roll of duct tape (which should be used for anything but connecting ducts) will work well in many cases for securing any loose insulation.
Have fun, wear a dust mask and eye protection under the house, and don't hit your head.