Black Mold in Air Conditioners

Black mold can lower your home’s air quality, harming your health. This is because it can prompt some allergic reactions, especially in people with mold allergies. Some toxic molds can even cause severe damage to your body’s immune system.

It’s already bad enough to have black mold growing in places like your bathroom or basement, but what if mold starts growing in your air conditioner? Luckily, in this article, you’ll learn how to prevent it, and what to do in case you do find it in your HVAC system.

Does Black Mold Pose Any Danger If it Starts Growing in Your HVAC System?

Black mold growing in your home will begin releasing spores into the air which you may end up inhaling. As per the Center for Disease Control (CDC), inhaled mold can lead to a number of health issues, including eye irritation, coughing or wheezing, throat irritation, and nasal stuffiness. In some cases, mold spores can even be responsible for irritation to the skin.

People allergic to mold may have severe reactions to mold. The same applies to people with compromised immune systems.
The mold that grows in the air conditioning system isn’t necessarily more hazardous than mold growing elsewhere in your home. That said, the air conditioning will be more efficient at distributing the mold spores throughout your home. That’s because your AC is designed to distribute air throughout your house.

hvac black mold

If the concentration of mold spores is high enough, a mold problem will be inevitable.

How Does Black Mold Grow in an HVAC system?

While not always black mold, mold spores can be found everywhere. Sadly, it’s impossible to ensure your home is 100% mold-free. Even if you were successful at doing it, more mold spores would come every time you opened a window or door.

When spores grow into mold, more and more spores are released. The higher the concentration, the more the health problems will occur. Therefore, the key to preventing a mold problem is by preventing it from growing in the first place.

For mold to grow, it needs two crucial things: moisture and a food source. Moisture can occur in a variety of ways, including from spills, leaks, and high humidity. As for the food source, it can range from wood to organic particles found in dust.

Generally, an AC system doesn’t provide a perfect home for black mold to grow. That’s because Styrofoam channels and sheet metal ducts inside window units don’t offer a food source like wood to mold. However, dust usually collects in those places and that can allow mold growth.

How Do I Get Rid of Black Mold in My Air Conditioner?

The following are practical steps you can take to get rid of black mold from your air conditioning system:

1. Clean the Evaporator Coil

Mold thrives in areas that are damp and well-shielded from sunlight. Therefore, it isn’t surprising to find mold has grown on the evaporator coil. The evaporator coil is enclosed with the plenum of the AC system and is damp and dark, providing the best conditions for mold growth.

removing black mold from air conditioner

The evaporator coil is designed to remove latent heat from the air passing through it. The growth of mold in the coil can directly affect the performance of the AC system. Without good airflow, the evaporator coil won’t be able to perform efficiently.

Ideally, you should have your evaporator coil cleaned on an annual basis to minimize the chances of mold growth.

2. Replace Your Air Filter on a Regular Basis

A clogged air filter will do a poor job of preventing mold growth. In fact, when an air filter is clogged, it’ll actually provide an ideal environment for mold to grow. This is especially true if the air filter is exposed to high moisture or humidity levels.

To prevent mold spores from getting circulated throughout your home by your AC system, replace the air filter regularly.

Preferably, once every three months. You should even increase the rate of replacement if you have a pet. In this case, you should consider doing the replacement on a monthly basis.

3. Drain the Drip Tray as Often as Necessary

The condensate drip tray is located right below the evaporator coil. Moisture condenses on the drip tray as latent heat from the air is removed by the evaporator coil.

Due to its function, the drip tray is usually a hotbed for mold growth. This is especially true if the condensate is being blocked from draining properly.

drain drip tray

Always clean and disinfect the drip tray after cleaning the evaporator coil. You should also check the drip tray for holes, cracks, or rust spots that could lead to water leaks.

4. Minimize Humidity Levels in Your Home

Black mold thrives in humid environments. So, ensuring your home humidity levels remain at a certain threshold is key to preventing mold growth in your AC system. According to most experts, always maintain a humidity level of between 30% and 50%.

In most cases, all you have to do to control excess humidity is by turning on your air conditioning system. Your AC system can help dehumidify your home to a certain extent.

For best results, consider using a stand-alone dehumidifier. You can get a dehumidifier in multiple variants, from whole-house ones to portable ones.

5. Consider Installing an Ultraviolet Germicidal Lamp

Another effective way of dealing with black mold growth is by installing a UV germicidal lamp. Ultraviolet rays have been clinically proven to be effective in curbing the growth of mold and bacteria.

For best results, you should install the lamp near an evaporator coil and other places that are hotbeds for mold growth.

Besides killing mold spores, the lamps are also proven to be effective against bacteria and viruses.

Bottom Line

Black mold growing in your air conditioning system can be a source of health issues for you and your family. Once the problem has occurred, removing it can be difficult and possibly expensive.

The best way to deal with a mold problem is to prevent it from happening in the first place. With a little bit of luck, these tips should prove helpful in that regard.

If you suspect you have a black mold issue in your AC or anywhere else in your home, call Markham Services today! We will inspect and test possible mold growth to determine the best steps for you to take.