Is Mold Lurking in Your HVAC System?

Posted: July 21, 2025 at 10:05 am
By: Lakes Region HVAC

When we think of mold, we typically check the usual suspects—bathroom tiles, basement corners, or around leaky windows. But there’s one place most people overlook: your HVAC system. Unfortunately, this is one of the worst places for mold to grow. If it takes hold, your system can circulate mold spores throughout your home or building, potentially impacting everyone’s health.

Why Mold Grows in HVAC Systems

Mold thrives in dark, damp, and warm environments—conditions your HVAC system can easily create, especially during the summer. When condensation forms inside ductwork and organic matter builds up, it creates an ideal breeding ground for mold spores. Without proper maintenance, your HVAC system can become a hidden source of indoor air pollution.

Signs Mold May Be Present

Watch for these common red flags:

• A musty or mildew-like smell coming from your vents
• Frequent allergy symptoms or respiratory issues
• Discoloration around air vents, drip pans, or duct openings
• Excess condensation on your AC unit or ductwork
• Unexplained health symptoms among household members

How to Address and Prevent Mold

If you suspect mold in your HVAC system, don’t wait. These steps can help restore clean air and prevent future problems:

1. Schedule a professional inspection
2. Clean and sanitize vents and surrounding areas
3. Upgrade your air filters, or change them more frequently
4. Use dehumidifiers to reduce excess moisture
5. Stick to a maintenance schedule, ideally twice a year