Protect Your Home from Black Mold on AC Coils


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Mold can be a serious problem in any home, especially when it grows on air conditioning (AC) coils. Black mold is the most dangerous type of mold and if left untreated, it can lead to costly damage and health issues for homeowners. Identifying black mold growth early is important so that proper measures are taken as soon as possible.

We will discuss what black mold is, the causes of black mold on AC coils, the signs of black mold on AC coils, prevention tips, and what mold removal services are available in the Orlando, Florida, area for your AC-based mold issues.

What is Black Mold?

Black mold is a fungus that can grow in damp, dark places. It is usually black or greenish-black and has a musty odor. The most common types of black mold are Stachybotrys chartarum (also known as “toxic black mold”) and Aspergillus niger.

Black mold can cause health problems if it is inhaled or ingested, so it's important to be aware of its presence in your home.

Definition of Black Mold

Black mold is an umbrella term for several species of fungi that thrive in moist environments with little light and air circulation. These molds produce toxins called mycotoxins which can cause adverse effects when exposed to humans and your dog, cat or any other pet that shares your home over long periods.

Types of Black Mold

The two most common types of black mold are Stachybotrys chartarum (also known as “toxic black mold”) and Aspergillus niger.

Both have the potential to cause serious health issues if left unchecked, but S. chartarum tends to be more toxic than A. niger due to its production of higher levels of mycotoxins like trichothecenes and atranones which can lead to respiratory illnesses such as asthma or bronchitis when inhaled over long periods time.

Health Effects Of Black Mold

High concentrations of these mycotoxins may result in symptoms such as coughing, sneezing, headaches, nausea, skin irritation, eye irritation, fatigue and even neurological disorders, depending on the individual's sensitivity level.

In extreme cases where large amounts have been ingested or breathed in for extended periods, there may also be an increased risk for cancer development. Therefore, it is important to identify any signs early on and take necessary steps immediately upon discovery.

Black mold can be a serious health hazard if not addressed properly, so it is important to understand what it is and how it can affect your home. Knowing the causes of black mold on AC coils can help you take the necessary steps to prevent and remediate any issues with your air conditioner unit.

Causes of Black Mold on AC Coils

Moisture Buildup and Standing Water

Moisture buildup and standing water are the most common causes of black mold growth on air conditioner coils. This can occur when condensation builds up inside the unit due to inadequate ventilation or insulation or any leaks in the system.

If left alone, this moisture can create an ideal environment for mold spores to thrive and spread throughout your home.

Poor Ventilation and Insulation Around the Unit

Poor ventilation and insulation around your air conditioner unit can also lead to black mold growth on its coils. Without proper airflow,  warm air from outside will be drawn into your AC unit and cause condensation to form inside it.

Insufficient insulation will allow cold drafts from outside to enter your home, which could result in a temperature difference between indoors and outdoors that encourages mold growth.

Leaking pipes or roofs near your AC unit may also contribute to black mold growth on its coils, as they provide additional sources of moisture for it.

Even small amounts of water dripping onto the unit can encourage mold spores to grow quickly since they need only a tiny amount of water vapor to survive and reproduce rapidly within a short period.

Mold growth on AC coils is caused by moisture buildup, poor ventilation and insulation, or leaking pipes nearby. To identify black mold on your air conditioner unit, look for visible discoloration of the coils, musty odors coming from the unit, and allergy symptoms after using it. If it's infested, you can have the same issues with your car.

Signs of Black Mold on AC Coils

Visible Discoloration on the Coils

One of the most obvious signs of black mold growth on air conditioner coils is visible discoloration. The coil may be dark green or black, and there may also be patches of white or yellowish-green fuzz growing on it. If you notice any discoloration, it’s important to take action immediately, as this could indicate that your AC unit has been contaminated with mold spores.

Musty Odor Coming from the Unit

Another sign that your AC unit may be infested with black mold is a musty odor coming from the unit. This smell can often be described as “musty” or “damp” and lingers in the air even when no one uses the air conditioner. It would be easy to compare this smell to an old, dank attic or basement. If you notice an unpleasant smell coming from your AC unit, it could mean that there are high levels of mold present.

Allergy Symptoms After Using The Air Conditioner

Lastly, if you start experiencing allergy-like symptoms after using your air conditioner such as sneezing, coughing, watery eyes, or the sudden onset of persistent headaches, then this could indicate that black mold is present in your system.

Mold spores can easily become airborne and cause allergic reactions when inhaled so if you experience any of these symptoms while running your AC  then it would be wise to get it checked out by a professional immediately for proper diagnosis and treatment options.

It's important to recognize the signs of black mold on AC coils, as it can cause serious health problems. Taking preventative measures and performing regular maintenance are key in avoiding this problem. Let's now look at how you can take action to prevent and maintain your air conditioner unit from developing black mold.

Prevention and Maintenance Tips for Avoiding Black Mold on AC Coils

Regularly Clean and Replace Filters in Your Air Conditioner Unit

It is important to regularly clean or replace the filters in your air conditioner unit as this helps to reduce the amount of moisture that can build up inside. This will help prevent mold growth on coils and improve the efficiency of your system. To keep your AC running smoothly, it’s recommended that you change out or clean your filter every month during peak usage times such as summer months when you are using it more often.

Ensure Proper Ventilation and Insulation Around the Unit

Proper ventilation and insulation around an air conditioning unit are key for preventing black mold from growing on its coils. Ensure adequate airflow is around all sides of the unit so that warm air does not get trapped near it, which can cause condensation buildup, leading to mold growth. Ensure any insulation surrounding the unit is properly sealed off so no moisture can seep into areas where it shouldn’t be.

One of the most common causes of black mold on AC coils is leaks or moisture buildup in the system. Notice any water damage in walls or ceilings near your AC unit.

If left unchecked, this could be a sign of a leak somewhere, causing excess moisture accumulation nearby, leading to mold growth on its coils over time. Therefore, inspecting these areas periodically for signs of water damage and having them repaired immediately to avoid further issues with black mold growth on your AC unit's coils is important.

Regular maintenance and preventative measures can help reduce the risk of black mold growth on AC coils. Still, it's important to remember that professional water damage restoration and mold services may be necessary for more serious cases. Let's look at the benefits of hiring professionals for this job.

Professional Water Damage Restoration and Mold Remediation Services for AC Coils

Professional water damage restoration and mold remediation services for air conditioner coils can help homeowners protect their homes from further damage and health risks. These services involve thoroughly inspecting the unit, removing any affected materials, and a professional cleaning to restore the system to its original state.

Benefits of Professional Services

Professional water damage restoration and mold abatement services provide several benefits over DIY solutions. Professionals have access to specialized equipment unavailable to most homeowners, such as HEPA filters, vacuums, and ozone generators, to remove airborne contaminants. Additionally, professionals will be able to identify potential sources of moisture or other problems that may lead to future mold growth.

Steps Involved in Professional Services

The steps involved in professional water damage restoration and mold remediation services typically include an initial assessment by certified technicians who will inspect the area for signs of contamination or structural damage caused by water intrusion.

If black mold is found on AC coils, they will use specialized tools such as HEPA filters to remove it safely without spreading spores into other areas of your home.

Afterward, all affected materials must be removed before disinfecting with EPA-approved products designed specifically for this purpose.

Finally, new insulation and drywall may need to be installed depending on the extent of the problem before sealing off any remaining openings.


It is important to take proactive steps in preventing black mold on AC coils. Regular maintenance and cleaning of the coils and proper ventilation can help reduce the risk of mold growth.

Suppose you have noticed signs of black mold on your AC coils or suspect that there may be a problem. In that case, it is best to immediately contact a professional water damage restoration and mold remediation contractor. A professional can assess the situation and provide an effective solution for removing any existing black mold from your AC coils.

Are you dealing with black mold on your air conditioning coils in Orlando, Florida? Damage Control 911 is the area's leading water damage restoration and mold remediation contractor. We have years of experience helping customers restore their homes after a flood or other disaster. Our team can quickly assess the situation, provide an estimate for services needed, and perform all necessary work to remove black mold from AC coils safely and effectively. Contact us today so we can get started on restoring your home!


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