Why does my house smell musty when the AC runs?

A musty smell when the air conditioner starts is usually biological growth on the evaporator coil, in the condensate drain pan, or inside ductwork — places that stay dark and damp all cooling season. The blower then pushes those odors through every room.

Fix the Source, Not the Smell

The fix depends on the source: coil cleaning, drain pan and condensate service, duct cleaning and sanitization, UV lamps that prevent coil growth, or whole-home dehumidification. Testing and inspection identify which one your system needs — solving the cause instead of masking the odor with fresheners.

Your Local Air Quality and HVAC Experts

All Set HVAC serves Arlington Heights and the Chicago Northwest Suburbs as the local expert in air quality testing, HVAC maintenance plans, and new heating and cooling installations. We find the cause instead of chasing symptoms, and we stand behind every job with the All Set Guarantee. Schedule your $99 Air Score Test at (847) 807-6100 today.