Why Does My AC Smell Like Mildew?


If you turn on your air conditioning system only to smell the musty smell associated with mold and mildew growth it can certainly put a damper on your mood. Air conditioning should be refreshing and comfortable, but otherwise undetectable. The only thing more miserable than dealing with the hot, sticky conditions is dealing with a foul smell coming from your air conditioning vents.

If you AC smells like mildew, mold, or other foul odors, it is time to troubleshoot the problem and perhaps call for professional assistance.
Common Causes For Mildew Smell From Your AC
Mold and mildew odors are some of the most common odors found in air conditioning duct work and they can occur for a variety of reasons. A properly functioning air conditioning system should overcome the presence of moisture–the building blocks for mold and mildew growth.
Here are the most common causes for mildew odors to occur in HVAC systems:
– Dirty or Clogged Filters
If your filter is dirty, clogged, or gets too much exposure to moisture, mildew can begin to grow. Filters trap tiny organic particles that can accelerate mildew growth when exposed to moisture. Check your filters first and if they appear dirty, replace them.
– Clogged Drip Pan
If your drip pan is clogged, is filling too fast, or has been moved and is no longer positioned where it should be, this can cause mildew growth in and around your air conditioning system. If it is a simple visible clog, you can likely remedy this problem yourself, but more extensive problems may require professional assistance.
– Clogged Condensate Drain Line
The condensate drain line runs from the coils to the outside of the AC unit and removes condensation created by the coils. If it is clogged, mildew may accumulate on and around your coils.
– Moist Ductwork
This can occur if your ducts are not well sealed or if your AC system is not removing moisture from the air as well as it should. Excess moisture in your ducts can lead to mold and mildew growth, then spread that odor throughout your house until the source of the moisture is address.
– Internal Problems
Sometimes, the interior parts of your air conditioning system may be dirty or have mildew growth.
For help with a mildew smell from the air conditioner, contact us and we can help you to resolve the problem.
+971 4 32 11 955

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