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Why Does My AC Smell Musty?


On a hot day, the first thing you do when you return to a warm, stuffy home is switch on the air conditioner to circulate some cool air. However, there is nothing relaxing or comfortable about turning on your AC and smelling a strong, musty odor. Why does this happen?

There are several reasons for that musty smell and they are all related to the unchecked growth of mold and mildew:

  • Mold or mildew may have grown on the condenser coil inside the AC unit if there is a problem with moisture or drainage.
  • The condensate drain line may be clogged, allowing mildew tp accumulate on and around your coils.
  • Mold or mildew growing in the ductwork if there is a leak in a duct.
  • Drip pans that are clogged, filling too fast, or are no longer positioned where they should be, allowing mildew growth in and around your air conditioning system
  • Dirty, clogged filters trap tiny organic particles that can accelerate mildew growth, especially in our humid climate.

Whatever the source of the mold and mildew, when the air flows through the vents, it spreads mold spores throughout your home, which is unhealthy and can cause intense allergic reactions. If you are noticing an uptick in your allergy symptoms accompanied by musty smells from your AC, give us a call today to schedule a Spring Checkup of your system. We’ll check your entire system, locate the source of the smell and give you a plan of action for eliminating the cause so the only thing that comes out of your vents is cool, clean air!

Contact Air One Heating and Cooling

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