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Does an Air Conditioner Kill Mold?

Air Conditioner units outside in Cedar Park, TX

Your air conditioner can do several things––keep your home’s indoor air cooler than outdoor temperatures, help to keep indoor airborne allergens at bay, and control your home’s humidity levels. But one thing it cannot do is kill mold. It can help prevent mold, but once it exists, your air conditioner cannot kill it. If you find mold somewhere in your HVAC system, particularly in your air conditioner or ductwork, call Arise Services for assistance. We can guide you on how to rid your home of the mold and help maintain your HVAC system to prevent the mold from recurring.

How Does Mold Occur?

Mold requires a warm and humid environment in order to grow. That means water is part of mold’s equation. Remove the water, and mold can’t live. According to the U.S. Environmental Protection Agency (EPA), mold already exists in all homes, even in your Cedar Park, TX, home. In most cases, it exists on such a small scale that it is not noticeable and does not pose a health risk.

A mold-ideal environment can be created due to an unknown or ignored leak somewhere in your home or due to high humidity. An environment with over 70 percent humidity is a definite breeding ground for mold. A small water leak in your HVAC system or ignored air conditioner drains and pans that are holding water, an evaporator coils or air handler could very well be an origin of mold. Once the mold begins to grow, the spores can travel through your home’s air conditioner duct system causing a multitude of problems.

How Can My Air Conditioner Prevent Mold?

As already mentioned, mold thrives in warm, humid environments. Your air conditioner is designed to help dehumidify your home by removing moisture from the conditioned air, thereby preventing mold’s growth. Keeping your air conditioner running in humid weather is a proactive step. Mold also likes stale air. Running your air conditioner provides proper air circulation in your home thereby preventing mold’s growth.

What Do I Do If I Spot Mold?

Even if you take the proper precautions against mold in your home, you may still come across some, maybe within your air conditioner or duct system itself. What should you do? There are times you can kill and clean mold yourself, when there’s just a small amount that is accessible. Sometimes you need a professional, as mold spores can be a health risk. It’s not uncommon for HVAC air handlers, evaporator coils, and condensation pans to grow mold in mold-friendly environment. A certified professional, like ours at Arise Services, can address HVAC mold problems during a regular air conditioner preventive maintenance visit or service appointment. We can also give tips on how to avoid its recurrence. Call and speak to one of our certified experts at 512-267-5000 with any questions your may have. Also visit the U.S. EPA site ( to learn more about mold.

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