Eliminate bad AC odors
Why Does My Air Conditioner Smell Bad When It Runs?
Strange AC smells can indicate mold, electrical issues, or a clogged drain line. Identifying the cause early can prevent further damage to your system and improve indoor air quality.
Common AC Smells and Their Causes
Different AC odors indicate different underlying issues. Understanding these smells can help you determine if immediate repairs are needed.

Why Your AC Might Smell Bad
- Musty smell: Mold or mildew growth in the ducts or drain pan.
- Burning smell: Overheating motor or electrical wiring issues.
- Rotten egg smell: Possible gas leak—shut off your system and call a professional.
- Chemical smell: Refrigerant leak, which can impact cooling efficiency.
How to Fix a Smelly Air Conditioner
Check and clean the AC drain line, replace air filters, and inspect for mold buildup. If the smell persists, professional servicing may be needed.