No one wants to think about a lurking, silent invader in their home — one that slowly grows behind walls and throughout HVAC systems.

We’re talking about mold, of course. And while it’s an unpleasant (and common) experience for many homeowners, knowing how to stop its spread is just as important as spotting the early warning signs.

Every homeowner should look out for mold in air vents, heating systems, and cooling systems. We’ll explain why mold forms in air vents, how to stop it from spreading, and when to call a professional. Remember: When it comes to mold, early action is key.

What Causes Mold in Air Vents?

Many of our homes’ HVAC systems rely on air vents. Your supply and return vents circulate heated or cooled air throughout a space.

Mold often forms in air vents when moisture builds up inside ductwork or the HVAC system, like a central AC unit or heat pump. Leaks or condensation from high humidity are the most common culprits, creating an ideal environment for mold.

Mold is especially likely to grow when air filters are dirty or clogged. That’s why regular filter changes and annual HVAC tune-ups are so valuable.

Signs You Have Mold in Your Air Vents

Thankfully, there are more than a few warning signs that mold may be hiding in your air vents:

• Visible mold: This one’s obvious; if you spot black, green, or white patches inside your vents, call an HVAC professional immediately.
• Musty smells: Mildewy odors often point to mold growth inside the ductwork.
• Respiratory symptoms: Frequent coughing, sneezing, or a runny nose can indicate poor air quality caused by mold spores.
• Trapped moisture: If you see condensation around vents or damp spots near your heating or cooling system, it’s time to call a professional.

Health Risks of Mold in Your HVAC System

Mold is no small matter, it’s crucial to schedule a professional HVAC inspection and cleaning at the first signs of mold in your home. Certain populations are particularly susceptible to indoor mold, including young children, older folks, and immunocompromised people.

People with asthma should be especially careful, too. According to the American Lung Association, asthmatics who are allergic to mold may experience reduced lung function and, in severe cases, life-threatening asthma attacks.

Short-Term Effects

Even for those without underlying conditions, short-term mold exposure can lead to:

• Coughing or sneezing
• Itchy eyes or skin
• Headaches
• Fatigue

Long Term Effects

If left unresolved, mold exposure can cause long-term health issues, including:

• Chronic sinus infections
• Lung inflammation
• Increased risk of serious illnesses like pneumonia

How To Safely Remove Mold from Air Vents

If you’ve spotted a small patch of mold in or around your air vents, there are a few DIY steps you can take to clean it up. Follow precautions to protect yourself and avoid spreading mold:

1. Open windows to properly ventilate your home.
2. Carefully remove vent covers and place them in a sealed plastic bag or washable container.
3. Put on gloves and a mask.
4. Use a solution of vinegar and water to thoroughly scrub the vents with a soft brush or cloth.
5. Allow the vents to dry before reassembling.

If you discover mold across multiple vents or deep in your ductwork, call a mold remediation specialist.

How To Prevent Mold From Returning in Air Vents

Keeping mold at bay starts with regular HVAC maintenance and periodic duct cleaning. Installing a dehumidifier can help improve ventilation and moisture control, too — especially during Baltimore’s humid summers.

Upgrading to higher MERV filters and sealing ductwork leaks help protect your HVAC system and keep indoor air cleaner and mold-free.

Why Choose United Air Temp?

If you suspect that your home’s cooling or heating needs a closer inspection, our experts are ready to help. United Air Temp is proud to serve Baltimore homeowners with quality work that improves home comfort.

Trust our highly trained team members for timely, same-day service for urgent HVAC service.

Choose UAT, a leader in home comfort since 1931. Contact us today to schedule ductwork or indoor air quality services for your Baltimore home.