Atlanta Air: Moldy AC Inflaming Summer Lungs?

By Franklin Everett Shaw

December 28, 2025

The air in Atlanta in July isn’t just hot; it’s a thick, soupy blanket. You walk outside, and suddenly you’re swimming. And that humidity? It’s a breeding ground for mold, especially when your AC is working overtime to keep your home a cool oasis. But what if that AC is actually making you sick?

Mold loves dark, damp places, and your AC unit, particularly the evaporator coil, is prime real estate. When mold spores circulate through your vents, they can trigger a range of health issues, especially for those with allergies or asthma. Ignoring this problem can lead to chronic respiratory problems and a significant decrease in your quality of life.

So, how do you know if your AC is the culprit, and what can you do about it? Let’s dive in, Atlanta-style.

First, let’s talk symptoms. It’s easy to dismiss a cough or a stuffy nose as just another summer cold, but pay attention to these potential signs of mold exposure, especially if they worsen when the AC is running:

Persistent cough or sore throat: That tickle in your throat that just won’t go away.
Sneezing and runny nose: More than just a seasonal allergy flare-up.
Watery, itchy eyes: Feeling like you’ve been swimming in a chlorinated pool.
Headaches: Especially if they’re accompanied by other respiratory symptoms.
Fatigue: Feeling unusually tired, even after a full night’s sleep.
Skin rashes or irritation: Unexplained itchy patches on your skin.
Asthma flare-ups: Increased wheezing, shortness of breath, or chest tightness.

These symptoms can mimic other conditions, so it’s crucial to consider the context. Do they improve when you leave your home for an extended period? Do they worsen when you turn on the AC? If so, mold could be the problem.

Now, let’s get practical. Here’s a step-by-step DIY guide to cleaning your AC unit and preventing mold growth. This focuses on window units and the indoor components of central AC systems. Always disconnect the power before cleaning!

Step 1: Gather Your Supplies

You’ll need:

A screwdriver
A vacuum cleaner with a brush attachment
A spray bottle
A mold-killing cleaner (more on this later)
A soft brush or cloth
Gloves and a mask (for your protection)

Step 2: Inspect for Mold

Carefully remove the AC unit’s front panel and inspect the coils, fins, and drain pan for visible mold growth. Look for dark spots, discoloration, or a musty odor. For central AC units, locate the indoor air handler and inspect the accessible components.

Step 3: Vacuum the Components

Use the vacuum cleaner with the brush attachment to remove dust, debris, and loose mold from the coils, fins, and drain pan. Be gentle to avoid damaging the delicate fins.

Step 4: Apply Mold-Killing Cleaner

This is where choosing the right cleaner is crucial. Avoid harsh chemicals like bleach, which can damage the AC unit and release harmful fumes. Instead, opt for a mold-killing cleaner specifically designed for HVAC systems.

Option 1: Concrobium Mold Control: This is a readily available, EPA-registered product that effectively kills mold and prevents regrowth. It’s safe for use on HVAC systems and doesn’t require rinsing.
Option 2: Benefect Decon 30: This is a botanical disinfectant that kills mold and bacteria without harsh chemicals. It’s a good option for those with sensitivities to chemical cleaners.
Option 3: DIY Solution (Use with Caution): A mixture of white vinegar and water (1:1 ratio) can be effective for mild mold growth. However, it’s essential to ensure the area is thoroughly dried afterward to prevent further mold growth.

Spray the cleaner liberally onto the affected areas, ensuring complete coverage. Let it sit for the recommended time (usually 10-15 minutes) to kill the mold.

Step 5: Wipe Clean

Use a soft brush or cloth to gently wipe away any remaining mold and cleaner residue. For hard-to-reach areas, use a cotton swab.

Step 6: Dry Thoroughly

This is critical. Mold thrives in damp environments, so ensure all components are completely dry before reassembling the AC unit. You can use a clean, dry cloth or a fan to speed up the drying process.

Step 7: Reassemble and Run

Once everything is dry, reassemble the AC unit and turn it on. Monitor for any unusual odors or symptoms.

Common Mistakes and Pitfalls

Using Bleach: As mentioned earlier, bleach can damage your AC unit and release harmful fumes. Avoid it.
Not Drying Thoroughly: This is the biggest mistake. If you leave any moisture behind, you’re essentially providing the perfect breeding ground for mold to return.
Ignoring the Drain Pan: The drain pan is a common source of mold growth. Make sure to clean it thoroughly and ensure it’s draining properly. A clogged drain line can lead to water buildup and mold growth.
Not Changing Air Filters Regularly: Dirty air filters restrict airflow and can contribute to mold growth. Change your air filters every 1-3 months, or more frequently if you have pets or allergies.
Only Cleaning the Visible Mold: Mold often grows in hidden areas. Make sure to inspect and clean all accessible components of your AC unit.

When to Call a Professional

While DIY cleaning can be effective for mild mold growth, there are times when professional HVAC cleaning is necessary. Consider calling a professional if:

You have severe mold growth: If the mold is extensive or difficult to reach, it’s best to leave it to the professionals.
You have persistent symptoms: If your symptoms don’t improve after cleaning the AC unit, there may be other sources of mold in your home.
You have a central AC system: Cleaning the ductwork of a central AC system requires specialized equipment and expertise.
You’re not comfortable cleaning the AC unit yourself: It’s better to be safe than sorry. If you’re not confident in your ability to clean the AC unit properly, hire a professional.

Atlanta Resources for HVAC Cleaning and Mold Remediation

Here are a few reputable HVAC cleaning and mold remediation companies in the Atlanta metro area:

Atlanta Air Experts: Specializes in air duct cleaning and HVAC system maintenance.
Mold Busters Atlanta: Offers comprehensive mold inspection, testing, and remediation services.
Ductz of Greater Atlanta: Provides professional air duct cleaning and HVAC system restoration.
AAA Heating & Air: Offers HVAC cleaning and maintenance services, including mold prevention.

Improving Indoor Air Quality Beyond AC Cleaning

Cleaning your AC unit is a great start, but there are other steps you can take to improve your indoor air quality and protect your lung health:

Use a HEPA air purifier: HEPA filters can remove mold spores, dust, pollen, and other allergens from the air.
Control humidity levels: Use a dehumidifier to keep humidity levels below 50%.
Ventilate your home: Open windows and doors regularly to allow fresh air to circulate.
Fix leaks promptly: Water leaks can create a breeding ground for mold.
Regularly clean and disinfect surfaces: Pay attention to areas prone to moisture, such as bathrooms and kitchens.

Living in Atlanta means embracing the heat and humidity, but it doesn’t mean sacrificing your health. By taking proactive steps to clean your AC unit and improve your indoor air quality, you can breathe easier and enjoy a healthier summer. Don’t let mold steal your peace of mind – take control and create a clean, comfortable home environment.