Noticing signs of mold in your air ducts?
ODORS. An unusual or musty odor is often the first sign of mold in air ducts or in air vents. In many cases, you’ll smell it before you can see it. If you notice a musty or moldy smell that goes away when you are not using your air conditioning or heating (if they share ducts), that can narrow the cause down to mold in your HVAC system.