Your AC is supposed to deliver clean, cool air, not a musty funk every time it kicks on. A musty smell almost always points to moisture and microbial growth somewhere in the system, and it’s worth addressing before it gets worse or starts affecting your air quality. Here’s what to look for.
What Causes the Musty Smell
Mold or mildew
This is the most common cause. ACs create moisture, and damp, dark components like the coils and drain pan are perfect spots for mold and mildew to grow. Once they do, the smell rides along with the air into your home.
A dirty, damp filter
A filter loaded with trapped dust and moisture can start to smell musty on its own. Regular replacement prevents it.
A clogged condensate drain
When the drain line backs up, water sits in the pan and grows bacteria, a classic source of musty odor.
Why You Shouldn’t Ignore It
Beyond being unpleasant, mold and mildew in your AC can aggravate allergies and breathing issues, since the system blows those spores into every room. A musty smell is your system telling you it needs a cleaning.
The Fix Is Usually a Good Cleaning
Replacing the filter, clearing the drain line, and cleaning the coils and pan typically clears it up, and a routine maintenance visit handles all of it at once. Bearcat’s tune-up cleans the spots mold loves and gets your air smelling fresh again. See our AC maintenance services, or call (509) 891-5110.
