Make sure that the crawl spaces are well-ventilated by having vents installed in the outside walls and using fans if required.
2. Put plastic covers over the dirt in the crawl spaces for preventing moisture from coming in from the ground.
3. Contemplate painting the concrete floors as well as utilizing area rugs rather than wall-to-wall carpet in the basements.
4. Get the basement floor checked for any cracks as well as have them repaired, if necessary.