How to Prevent Mold and Mildew in Your HVAC System

Prevention is key when it comes to mold. Here are the top steps you can take to keep your system clean, dry, and mold-free

Change Your Air Filter Regularly

Dirty filters trap dust and moisture—creating an ideal home for mold.

🛠 Tip: Replace your filter every 1–3 months. Use high-quality filters that trap small particles, especially if someone in your home has allergies or asthma.

 

Schedule Regular HVAC Maintenance

Professional maintenance helps catch moisture issues before they turn into mold problems.

🔧 During a seasonal tune-up, our Four Seasons Air Specialists team will:

• Clean evaporator and condenser coils
• Inspect and clean the drain pan
• Clear clogged condensate drain lines
• Check ductwork and airflow

 

Keep Humidity in Check

High indoor humidity fuels mold growth. Aim for 30–50% relative humidity inside your home.

💡 Solution: Install a whole-home dehumidifier or use portable dehumidifiers in damp areas like basements.

 

Improve Ventilation

Good airflow helps moisture evaporate and prevents stagnant air from building up inside your system.

🌬 Tip: Make sure vents and returns aren’t blocked by furniture. If your home has poor ventilation, consider upgrading your system or adding ventilators.

 

Use UV Lights for Extra Protection

Ultraviolet (UV) lights can be installed inside your HVAC system to kill mold spores, bacteria, and viruses on contact.

💡 Bonus: UV lights also help improve indoor air quality by keeping coils and components cleaner between maintenance visits.

 

Seal and Insulate Ductwork

Leaky or uninsulated ducts can attract condensation—especially in unconditioned spaces like attics or crawl spaces.

🛠 Fix: Properly sealed and insulated ducts help reduce moisture buildup and prevent mold growth inside your airways.

 

Clean Around Your Indoor Unit

Mold can form around your furnace or air handler if water pools on the floor or nearby surfaces.

🧽 Tip: Make sure the area around your indoor HVAC unit stays clean and dry. If you notice persistent moisture, call for service immediately.

 

Let Four Seasons Air Specialists Help You Breathe Easier

If you suspect mold or mildew in your HVAC system—or want to take steps to prevent it—our experienced technicians are here to help. We offer expert maintenance, indoor air quality solutions, and advanced filtration systems that keep your air clean and your system safe.

✅ Serving White Bear Lake and the surrounding areas since 1974

✅ Friendly, certified HVAC professionals

✅ Honest recommendations with no high-pressure sales

✅ 100% satisfaction guaranteed

📞 Schedule a maintenance appointment or air quality inspection today at: 651.426.5254