Musty Smell but No Visible Mold: What Could Be Happening?

Musty odors frequently come from growth hidden behind walls, under flooring, in crawl spaces, or in ductwork. The smell means microbial activity is likely present even if you can't see it.

A professional can use moisture meters, thermal imaging, and where appropriate air or surface sampling to locate hidden sources. The goal is to find both the growth and the moisture driving it.

Air fresheners don't solve the underlying issue. If you smell musty odors persistently, it's worth investigating the cause.