Houston AC: Is Duct Mold Drying Summer Livers?

By Franklin Everett Shaw

November 2, 2025

The air in Houston hangs heavy, thick with humidity, especially during the summer. It’s not just uncomfortable; it’s a breeding ground for mold, and your AC ducts are prime real estate. But the real problem isn’t just the mold itself; it’s the mycotoxins it releases, which can wreak havoc on your liver, your body’s primary detoxification organ. This isn’t just about allergies; it’s about long-term health.

This guide is your battle plan against duct mold in Houston, focusing on protecting your liver from mycotoxin exposure. We’ll cover everything from DIY inspections to professional remediation, Texas regulations, and even dietary strategies to support your liver.

First, let’s talk about why Houston is a mold paradise. The high humidity, combined with fluctuating temperatures, creates the perfect environment for mold growth inside your AC ducts. When your AC runs, condensation forms on the cold surfaces, providing the moisture mold needs to thrive. Dust and organic matter that accumulate in the ducts serve as food.

Warning signs specific to Houston include:

• A musty odor that intensifies when the AC kicks on, especially after periods of heavy rain.
• Visible mold growth around AC vents or on the exterior of ductwork, often appearing as black, green, or white patches.
• Increased allergy symptoms, such as sneezing, coughing, and itchy eyes, even when indoors.
• Unexplained fatigue, headaches, or other flu-like symptoms, which could indicate mycotoxin exposure.

Now, let’s get practical. Before calling a professional, you can perform a basic DIY inspection.

Step 1: Safety First. Wear a mask (N95 or better), gloves, and eye protection to avoid inhaling mold spores.

Step 2: Visual Inspection. Remove vent covers and use a flashlight to inspect the inside of the ducts. Look for any visible mold growth. Pay close attention to areas near joints and seams, where moisture tends to accumulate.

Step 3: The Swab Test. If you see suspicious spots, use a cotton swab to collect a sample. Send the swab to a certified lab for mold testing. This will identify the type of mold and determine if it’s toxic.

Step 4: Check the Drain Pan. The AC’s drain pan is another common breeding ground for mold. Ensure it’s draining properly and clean it regularly with a bleach solution (1 part bleach to 10 parts water).

If you find mold, don’t panic. Small, localized mold growth might be treatable with DIY methods. However, extensive mold contamination requires professional remediation.

Here’s where things get tricky. Many DIY mold removal products are ineffective or even harmful. Bleach, for example, only kills surface mold and doesn’t address the underlying problem. It can also create a breeding ground for mold to return even stronger.

For DIY remediation, consider using a borax-based cleaner. Borax is a natural mineral that effectively kills mold and inhibits its growth. Mix 1 cup of borax with 1 gallon of water and apply it to the affected areas. Let it sit for 15-20 minutes, then scrub gently and wipe clean.

However, remember that DIY methods are only suitable for minor mold problems. If the mold covers a large area or if you suspect it’s a toxic mold like Stachybotrys (black mold), call a professional.

Choosing the right mold remediation company in Houston is crucial. Here’s what to look for:

• Licensing and Certification: Ensure the company is licensed and certified by the Texas Department of State Health Services.
• Experience: Choose a company with a proven track record of successful mold remediation in Houston’s climate.
• Proper Equipment: The company should use professional-grade equipment, including HEPA vacuums and air scrubbers, to contain and remove mold spores.
• Detailed Assessment: A reputable company will conduct a thorough inspection to identify the source of the mold and the extent of the contamination.
• Clear Remediation Plan: The company should provide a detailed plan outlining the steps they will take to remove the mold and prevent its recurrence.

Texas regulations regarding mold remediation are outlined in the Texas Mold Assessment and Remediation Rules (TMARR). These rules require mold assessors and remediators to be licensed and to follow specific procedures to ensure the safety of occupants.

A common mistake developers make is neglecting to properly seal ductwork during construction or renovation. This allows moisture and dust to enter the ducts, creating a perfect environment for mold growth. Another pitfall is failing to address the underlying cause of the mold, such as a leaky roof or plumbing. If the source of moisture isn’t fixed, the mold will simply return.

Now, let’s talk about the liver. Mycotoxins produced by mold can damage the liver, leading to inflammation and impaired detoxification. Supporting your liver is crucial, especially if you’ve been exposed to mold.

Here are some dietary and supplemental strategies to consider:

• Eat a Liver-Friendly Diet: Focus on whole, unprocessed foods, including plenty of fruits, vegetables, and lean protein. Avoid processed foods, sugary drinks, and excessive alcohol, which can burden the liver.
• Include Liver-Supporting Foods: Certain foods, such as garlic, onions, broccoli, and artichokes, contain compounds that help detoxify the liver.
• Consider Milk Thistle: Milk thistle is a herb that has been shown to protect the liver from damage and promote its regeneration.
• Take a Multivitamin: A good multivitamin can help ensure you’re getting all the nutrients your liver needs to function properly.
• Stay Hydrated: Drinking plenty of water helps flush toxins from the body and supports liver function.

Specific challenges in Houston include dealing with the aftermath of hurricanes and flooding. Floodwater can contaminate AC ducts with mold spores and other pathogens, requiring immediate remediation. If your home has been flooded, it’s essential to have your AC system inspected and cleaned by a professional.

Another challenge is the prevalence of older homes in Houston, which may have outdated ductwork that’s more prone to mold growth. Consider upgrading your ductwork to a more modern, mold-resistant system.

Here’s a real-world scenario: A family in the Heights neighborhood of Houston noticed a musty odor in their home and increased allergy symptoms. They performed a DIY inspection and found mold growth in their AC ducts. They hired a licensed mold remediation company that identified a leaky roof as the source of the moisture. The company repaired the roof, removed the mold, and cleaned the ductwork. The family also adopted a liver-friendly diet and started taking milk thistle supplements to support their liver health.

In conclusion, dealing with duct mold in Houston requires a proactive approach. By understanding the warning signs, performing regular inspections, and taking steps to remediate mold and support your liver, you can protect your health and create a healthier home environment. Don’t underestimate the impact of mycotoxins on your liver; take action today to safeguard your well-being.