Rental Home Air Quality

[Shirley Moser]

I am having a problem with a tenant who claims that there is a musky smell and too much humidity.  What is the best way to insure that the rental is safe and keeps a good humidity level?  Do I get an air quality test or do I have to put in a dehumidifier in the house.  I've already put in a dehumidifier in the crawl space that I bought at Home Depot for 1,000 square feet.   Thanks for any suggestions that work for you.