Probably the most common culprit is a clogged filter. That’s bad news because your AC is most likely distributing mold and/or mildew spores throughout your home. Likewise, it may help to ensure your condensate line is clean and free of debris. When i turn on the the air con there is a ahorrible musty smell that comes out on the cool air and the fan. In your bucket, mix a solution of ½ cup bleach, 1 tablespoon mild dish soap, and 3 gallons hot water. These components can be cleaned with a special coil cleaner and rinsed off, making the process quite messy. The smell can be bad and can make you give up on turning on the AC, making your day worse. While it’s not an immediate threat, possible growths in your homes air conditioning and ductwork system could be circulation throughout your home affecting those on your home especially sensitive to poor indoor air quality, this could quickly turn into a serious problem. Source 3: Leaky air ducts. 1. Air conditioning should be refreshing and comforting. You can use a dryer vent brush to get the dust off of aluminum AC fans. who10 (author) from Midwest on July 11, 2012: We do this every year with ours. The most likely culprits include the following: 1. Have you noticed that your air vent smells musty? Musty or Moldy Smell. Add a little moisture, and you’ve got everything you need. Mold and mildew can build up when they find a nice damp, dark place to hide, and sometimes that includes your air conditioning system. Will that even help? If you remove water, the odor will go away. Air Ducts or Air Vents Are Holding Excess Moisture Cleaning your window air conditioner regularly is vital to keeping it in good working order. Editor: Window air conditioners can produce moldy odors if not maintained properly, usually when water from the unit doesn’t properly drain and mold or bacterial growth begin to fester inside. I reinstalled it in its cabinet and put a fan blowing on it for a good 6 hours. Without proper maintenance of the filters, coils, and drains, a portable air conditioner can become overrun with mold, but it is easily cleaned away in most cases. How to Get Rid of the Smell of Mildew From a Central Air Conditioner. However, it’s one thing to accept that fact when you’re outside. Nothing ruins the enjoyment of cool air quite like a mold or mildew smell coming with it. Musty Smells & Your Air Conditioner – What You Can Do. “Dirty Sock Syndrome” is when your air conditioner gives off a foul, moldy or mildew-like smell when you turn it on. It is a common complaint, as air conditioners are designed to improve the indoor air quality by pulling the excess humidity and moisture out of the air. Clogged Filter: Among the most common reasons of a foul odor emanating from your portable air conditioner is a clogged filter. This odor usually indicates the growth of mold or mildew. The air conditioner started blowing moldy musty air since the beginning of summer. Unfortunately, if that cool air is accompanied by a musty, mildew-y scent, you’ve got some work to do. All Rights Reserved. The downside is your air conditioner is stinky. Check out this window AC maintenance checklist for future reference and the video below showing how to clean air conditioner coils. But when your evaporator coil gets dirty over time, it becomes a breeding ground for mold.. The Homeowner’s Guide To The 7 Causes of Bad AC Smells. When not shown the proper TLC, such as with regular tune-ups, problems like small leaks in the air ducts, or a little clogging in the drain line could turn into a breeding ground for possible mold growth if not addressed soon enough. Accumulates water dirty over time A/C evaporator coil gets dirty over time spray a spray! Really needs to be safe than to injure yourself or mess up the unit outside by myself vents... 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