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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.

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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.

Jimmy, Owner of A&G Air Conditioning, servicing an HVAC unit in Orlando, FL

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.

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