Houston AC: Is Cheap Drywall Breeding Sinus Mold?

By Franklin Everett Shaw

August 12, 2025

Imagine waking up in your Houston home, the air thick with humidity, and a persistent cough that just won’t quit. You’ve cleaned, you’ve dusted, but the problem lingers. Could the very walls around you be the culprit? In Houston, especially after Hurricane Harvey, the answer might be a resounding yes, and it’s often linked to the drywall lurking behind your paint.

The aftermath of Hurricane Harvey saw a surge in construction and renovation across the Houston metropolitan area. To meet the demand, some builders turned to cheaper, often imported, drywall. This drywall, sometimes referred to as “Chinese drywall,” has been linked to a host of problems, including corrosion of electrical wiring, a sulfurous odor, and, crucially, the proliferation of mold, which can trigger or exacerbate sinus infections.

This isn’t just about a musty smell; it’s about your health. Let’s dive into how this drywall can impact your indoor air quality and what you, as a Houston homeowner, can do about it.

The Problem with Problematic Drywall

The issue stems from the composition of some drywall. High levels of sulfur compounds, particularly strontium sulfide, are present in certain imported varieties. These compounds off-gas, reacting with moisture in the air to produce hydrogen sulfide, carbonyl sulfide, and sulfur dioxide. These gases not only cause the unpleasant odor but also create an environment conducive to mold growth, especially in the humid Houston climate.

Why is this worse in Houston? The high humidity acts as a catalyst. The sulfur compounds react more readily, and mold spores thrive in damp conditions. This creates a perfect storm for sinus infections and other respiratory problems.

Visual Inspection: Your First Line of Defense

Before you start tearing down walls, a careful visual inspection is crucial. Look for these telltale signs:

Corrosion: Check copper wiring, especially around electrical outlets and appliances. Blackening or corrosion is a major red flag. This is often most noticeable on the back of your refrigerator or around your AC unit.
Odor: A persistent sulfurous or “rotten egg” smell, even after cleaning, is a strong indicator. Pay attention to areas with poor ventilation, like closets and bathrooms.
Discoloration: Look for unusual staining or discoloration on walls, particularly in areas prone to moisture. This could indicate mold growth behind the surface.
Manufacturing Markings: If possible, check the back of exposed drywall (e.g., in an unfinished attic or during renovations). Look for markings indicating the country of origin. While not all imported drywall is bad, it warrants closer inspection.

DIY Mold Testing: Taking Matters Into Your Own Hands

If you suspect a problem, DIY mold testing kits can provide preliminary insights. These kits typically involve collecting a sample of dust or surface mold and sending it to a lab for analysis.

Surface Testing: Use a swab to collect a sample from a visible mold patch. Follow the kit’s instructions carefully to avoid contamination.
Air Testing: Some kits include petri dishes to collect airborne mold spores. Place the dish in a suspected area for the recommended time, then seal and send it to the lab.

Important Note: DIY kits provide an indication, not a definitive diagnosis. A professional mold inspection is always recommended for accurate results and a comprehensive assessment.

AC Systems: A Mold Magnet

Your air conditioning system is a prime breeding ground for mold, especially when problematic drywall is present. The cool, damp environment inside the AC unit and ductwork provides ideal conditions for mold growth.

Here’s how to mitigate the risk:

Regular Filter Changes: Change your AC filter monthly, or more frequently if you have pets or allergies. Use a high-efficiency particulate air (HEPA) filter to trap mold spores.
Professional AC Cleaning: Schedule regular professional cleaning of your AC unit and ductwork. This removes accumulated dust, debris, and mold.
UV Lights: Consider installing a UV light in your AC system. UV light kills mold spores and other microorganisms, helping to prevent their growth.
Dehumidifiers: Use dehumidifiers to maintain a humidity level below 50% in your home. This inhibits mold growth.

Professional Remediation: When to Call in the Experts

If you suspect widespread mold contamination or if DIY tests come back positive, it’s time to call in a professional mold remediation company. Look for companies certified by organizations like the Institute of Inspection, Cleaning and Restoration Certification (IICRC).

Here’s what a professional remediation typically involves:

Inspection and Assessment: A thorough inspection to identify the source and extent of the mold contamination.
Containment: Sealing off the affected area to prevent the spread of mold spores to other parts of the house.
Removal: Removing the contaminated drywall and other materials.
Cleaning and Disinfection: Cleaning and disinfecting the affected area to kill any remaining mold spores.
Restoration: Repairing or replacing any damaged building materials.

Houston-Specific Resources:

Texas Department of State Health Services (DSHS): Provides information on mold assessment and remediation.
Better Business Bureau (BBB): Check the ratings and reviews of mold remediation companies in the Houston area.
Local Mold Inspectors: Search online for certified mold inspectors in Houston. Look for certifications like Certified Mold Inspector (CMI) or Certified Mold Remediator (CMR).

Challenges and Pitfalls

Misdiagnosis: Mistaking mold symptoms for allergies or other respiratory conditions.
Inadequate Remediation: Attempting to clean up mold yourself without proper equipment or training, which can worsen the problem.
Choosing the Wrong Contractor: Hiring an unqualified or unscrupulous contractor who doesn’t properly address the mold issue.
Ignoring the Source: Focusing on mold removal without addressing the underlying moisture problem that’s causing the mold to grow.

Overcoming these challenges requires vigilance, thorough investigation, and a willingness to invest in professional help when needed. Don’t cut corners when it comes to your health and the safety of your home.

Real-World Scenario: The Case of the Katy Homeowner

A homeowner in Katy, Texas, noticed a persistent musty odor in their home after renovations following Hurricane Harvey. They initially dismissed it as “new house smell,” but the odor persisted, and family members began experiencing increased sinus infections. A professional mold inspection revealed high levels of mold spores and the presence of problematic drywall. The remediation involved removing the contaminated drywall, cleaning the HVAC system, and installing a whole-house dehumidifier. The homeowner reported a significant improvement in air quality and a reduction in sinus infections after the remediation.

Actionable Insights for Houston Homeowners

Be Proactive: Don’t wait for symptoms to appear. If your home was built or renovated after Hurricane Harvey, consider a mold inspection.
Trust Your Gut: If you suspect something is wrong, don’t ignore it. Investigate the issue thoroughly.
Document Everything: Keep records of any inspections, tests, and remediation work. This can be helpful if you need to file an insurance claim or sell your home.
Educate Yourself: Learn about the risks of problematic drywall and mold, and stay informed about the latest remediation techniques.

Protecting your Houston home from the hidden dangers of problematic drywall and mold requires a proactive approach. By understanding the risks, recognizing the signs, and taking appropriate action, you can create a healthier and safer living environment for yourself and your family. Don’t let your walls make you sick. Take control of your indoor air quality today.