Denver Mold: AC Lies Inflaming Senior Lungs?

By Franklin Everett Shaw

January 15, 2026

The musty smell hits you the moment you turn on your AC. It’s not just an unpleasant odor; it’s a warning sign. In Denver, with our older homes and fluctuating humidity, mold in AC units is a common problem, especially for seniors. But don’t panic! This guide will walk you through identifying, addressing, and preventing mold growth, tailored specifically for Denver’s senior community.

First, let’s talk about why this is a Denver-specific issue. Many homes in neighborhoods like Capitol Hill, Baker, and even parts of Aurora were built decades ago. These older HVAC systems often have leaky ductwork and poor insulation, creating the perfect breeding ground for mold. The altitude also plays a role; drier air can lead to condensation within the system when temperatures fluctuate, providing the moisture mold needs.

So, how do you know if you have mold? Look for these telltale signs:

The Smell: A persistent musty or earthy odor coming from your vents, even after cleaning.
Visible Growth: Check around the AC unit itself, especially the drip pan and coils. Look for dark spots or fuzzy growth. Use a flashlight!
Health Symptoms: Increased allergy symptoms, respiratory issues, or unexplained headaches, especially when the AC is running.

Now, let’s get practical. Here’s a step-by-step guide to DIY cleaning, but always prioritize your safety. If you have any respiratory issues, ask a friend or family member for help, or consider calling a professional.

Safety First: Turn off the AC unit at the breaker. Wear gloves, a mask (N95 or better), and eye protection.
Inspect and Access: Locate the AC unit, usually outside or in a utility closet. Remove any access panels.
Clean the Coils: Use a coil cleaner specifically designed for AC units. You can find these at most hardware stores in Denver, like Ace Hardware on Colfax or Home Depot near I-25. Follow the instructions on the cleaner.
Clean the Drip Pan: This is where water collects and mold loves to grow. Remove the pan (if possible) and scrub it with a mixture of bleach and water (1 part bleach to 10 parts water). Rinse thoroughly. If the pan is not removable, carefully wipe it down with the bleach solution.
Clean the Vents: Remove the vent covers and wash them with soap and water. Vacuum the inside of the vents to remove any loose dust or debris.
Replace Filters: This is crucial! Use a high-quality filter to trap mold spores and other allergens. Change it regularly (every 1-3 months).
Reassemble and Run: Once everything is dry, reassemble the unit and turn it back on. Monitor for any lingering odors or symptoms.

Important Considerations for Older Denver Homes:

Asbestos: Homes built before the 1980s may contain asbestos in ductwork or insulation. If you suspect asbestos, do not disturb it. Call a professional mold remediation company that is also certified in asbestos removal.
Ductwork: If your ductwork is old and damaged, cleaning it yourself can be risky. Consider having it professionally cleaned or replaced.
Electrical Components: Be extremely careful around electrical components. If you are not comfortable working with electricity, call a professional.

When to Call a Professional:

DIY cleaning is effective for minor mold problems. However, if you experience any of the following, it’s time to call a professional mold remediation company:

Extensive Mold Growth: If the mold covers a large area or is difficult to reach.
Persistent Odors: If the musty smell persists after cleaning.
Health Problems: If your health symptoms worsen after cleaning.
Asbestos Concerns: If you suspect asbestos in your home.

Finding a reputable mold remediation company in Denver is crucial. Look for companies that are:

Licensed and Insured: This protects you from liability if something goes wrong.
Certified: Look for certifications from organizations like the IICRC (Institute of Inspection, Cleaning and Restoration Certification).
Experienced: Ask about their experience with mold remediation in older Denver homes.
Transparent: Get a detailed estimate and ask about their process.

Denver-Specific Resources for Financial Assistance:

Mold remediation can be expensive, but several resources are available to help low-income seniors in Denver:

LEAP (Low-income Energy Assistance Program): While primarily for heating bills, LEAP can sometimes provide assistance for energy-related home repairs, including mold remediation. Contact them at 1-866-HEAT-HELP (1-866-432-8435).
Denver Human Services: They offer various programs for seniors, including home repair assistance. Contact them at 720-944-4DHS (4347).
Brothers Redevelopment, Inc.: This non-profit organization provides home repair services for low-income seniors in Denver. They may be able to help with mold remediation. Call them at 303-202-6340.
Energy Outreach Colorado: This organization partners with local agencies to provide energy assistance and home weatherization services, which can help prevent mold growth. Visit their website or call 303-825-8750.

Preventing Future Mold Growth:

Prevention is key to avoiding future mold problems. Here are some tips:

Regular AC Maintenance: Schedule annual maintenance with a qualified HVAC technician.
Change Filters Regularly: As mentioned earlier, change your AC filter every 1-3 months.
Control Humidity: Use a dehumidifier to keep the humidity level in your home below 50%.
Improve Ventilation: Ensure proper ventilation in bathrooms and kitchens.
Address Leaks Promptly: Fix any leaks in your roof, plumbing, or around windows and doors.

Mold in your AC unit is a serious issue, but it’s one that you can address with the right knowledge and resources. By following these steps, Denver seniors can breathe easier and enjoy a healthier home environment. Don’t hesitate to seek professional help when needed, and remember to take advantage of the financial assistance programs available to you. Your health and safety are worth it.