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Why Your AC May Smell Like Mildew

Mildew and mold growing

When your air conditioner is blowing, do you notice a distinctive smell flowing through your home? There is a high possibility it could be mold or mildew spores entering your home through your air vents. In order to find out if mold is present in or around your ac unit, here is a list of likely causes.

Dirty Filters

After noticing the mildew smell disrupting your air quality, the first thing to check is the air filter. Because air filters capture tiny particles from your home’s air, there is a possibility that mildew growth found its way onto the filter through moisture pulled in from the air. Even if the smell doesn’t seem to be coming from the air filter, if its dirty it still needs to be replaced.

Clogged Condensate Drain Line

If your ac is shutting off after only a few minutes of running, check your indoor unit for any leaks or excessive water in the drain pan. If the problem is a clogged coil then you’ll need to clean it. This can be done by turning off the air conditioner and locating the coil. There are multiple ways to clean coils. You may use mild detergents and a microfiber cloth or use a vacuum. If you are not certain on how to clean the coils efficiently, contact a professional for help. Remember, regular maintenance is important to the health of your air conditioning unit.


Moisture can get into your ductwork if it isn’t properly sealed or the ac system isn’t removing moisture in the air due to another underlying issue. Excessive moisture can cause mold and mildew growth that can spread and eventually invade other parts of your home. If you believe mold is growing in your air ducts, contact a professional to examine your home’s air ducts and seal or replace it if necessary.

If there are any other issues you may have noticed or have any questions about your air conditioning unit, please call  American Air Care.  We have been giving professonal air conditioning service in Port St. Lucie and Martin County for over 25 years.

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