Dallas AC: Duct Mold Fueling Summer Allergies?

By Franklin Everett Shaw

November 8, 2025

Is your Dallas home feeling a little…stuffy? Do you ever catch a whiff of something musty when the AC kicks on? You might have mold lurking in your air ducts. Ignoring it won’t make it disappear; in fact, it could lead to serious health problems and costly repairs down the line. This isn’t about scare tactics; it’s about empowering you, the Dallas homeowner, to take control of your indoor air quality. Let’s dive into how you can assess your AC ducts for mold, what steps you can take to remediate it, and, most importantly, how to prevent it from coming back.

First, let’s talk about why Dallas is particularly susceptible to mold growth. The combination of high humidity and fluctuating temperatures creates the perfect breeding ground, especially within the dark, often neglected confines of your AC ductwork. Think of it as a damp, dark cave – mold’s ideal vacation spot.

So, how do you know if you have a problem? Here’s a DIY assessment you can perform:

The Sniff Test: Turn on your AC. Do you detect a musty, earthy odor emanating from the vents? That’s a major red flag.
Visual Inspection: This requires a flashlight and a bit of bravery. Remove a vent cover (usually held on by screws). Shine the flashlight into the duct. Look for visible signs of mold – dark spots, fuzzy growth, or discoloration. Pay close attention to areas near seams and joints, where condensation tends to accumulate.
The Cotton Swab Test: If you see suspicious spots, gently rub them with a damp cotton swab. If the swab comes back with a dark stain, it’s highly likely you’re dealing with mold.

Now, let’s be clear: this DIY assessment is a preliminary check. It’s not a substitute for professional testing. If you suspect mold, especially if you or your family members are experiencing allergy-like symptoms, it’s time to call in the experts.

Who are these experts, and what do they do? In Dallas, you’ll want to look for licensed HVAC professionals who specialize in mold remediation. They can perform air quality testing to determine the type and concentration of mold spores in your home. They’ll also have the equipment and expertise to safely and effectively remove the mold from your ductwork.

But before you pick up the phone, let’s talk about Texas regulations. The Texas Department of Licensing and Regulations (TDLR) oversees mold assessment and remediation. While homeowners can perform mold remediation on their own property, there are specific guidelines and best practices to follow. For larger infestations (over 25 contiguous square feet), it’s required to use a licensed mold remediation contractor.

Here’s where many homeowners stumble: they underestimate the severity of the problem. A small spot of mold can quickly spread throughout your entire ductwork system. Trying to DIY a large-scale remediation without the proper equipment and training can actually make the problem worse, releasing more mold spores into the air.

So, when should you call a professional?

If you have visible mold growth covering a significant area (more than a few square inches).
If you experience persistent allergy-like symptoms, such as coughing, sneezing, or watery eyes.
If you have a history of water damage in your home.
If you’re unsure about the type of mold or the extent of the infestation.

Okay, let’s say you’ve decided to call a professional. What can you expect? The process typically involves:

Inspection and Assessment: The contractor will thoroughly inspect your ductwork and perform air quality testing.
Containment: They’ll seal off the affected areas to prevent mold spores from spreading to other parts of your home.
Remediation: This involves physically removing the mold using specialized equipment, such as HEPA vacuums and antimicrobial solutions.
Cleaning and Disinfection: The contractor will clean and disinfect the ductwork to kill any remaining mold spores.
Prevention: They’ll identify and address the underlying cause of the mold growth, such as excessive humidity or leaks.

Now, let’s talk about prevention. This is where you, the Dallas homeowner, can really make a difference. Here are some practical steps you can take to keep mold at bay:

Regular AC Maintenance: Schedule annual maintenance for your AC system. This includes cleaning the coils, checking for leaks, and ensuring proper drainage.
Control Humidity: Use a dehumidifier, especially during the humid summer months. Aim for a humidity level between 30% and 50%.
Improve Ventilation: Ensure proper ventilation in your home, especially in bathrooms and kitchens. Use exhaust fans when showering or cooking.
Seal Leaks: Repair any leaks in your roof, plumbing, or windows. Water intrusion is a major cause of mold growth.
Consider UV Lights: Install UV lights in your ductwork. These lights kill mold spores and other microorganisms.
Regular Duct Cleaning: While not always necessary, consider having your ducts professionally cleaned every few years. This can help remove dust, debris, and potential mold growth.

A common mistake Dallas homeowners make is neglecting their attic. Attics are often poorly ventilated and prone to moisture buildup, which can lead to mold growth that eventually spreads to the ductwork. Make sure your attic is properly insulated and ventilated. Consider installing a ridge vent or soffit vents to improve airflow.

Another pitfall is using the wrong type of air filter. Opt for a high-efficiency particulate air (HEPA) filter. These filters trap mold spores and other allergens, improving your indoor air quality. Change your air filter regularly, at least every three months, or more often if you have pets or allergies.

Finally, let’s connect you with some local resources. The Better Business Bureau of Metropolitan Dallas offers a list of accredited HVAC contractors. The Texas Department of State Health Services provides information on mold and indoor air quality. And don’t hesitate to ask your neighbors for recommendations. Word-of-mouth is often the best way to find a reliable and trustworthy contractor.

Taking these steps will help you breathe easier, knowing you’ve taken proactive measures to protect your home and family from the dangers of mold. Don’t let mold take root in your Dallas home. A little vigilance and proactive maintenance can go a long way in ensuring a healthy and comfortable living environment.