Five Reasons Why Your AC Smells Musty in Lakehurst, NJ

Have you noticed that your AC smells musty when it cycles on? You’re not alone. This is a common issue for homeowners in Ocean County during our hot, humid summers. 

Dustin’s Plumbing Heating and A/C Repair is the leading provider of expert AC services in Lakehurst, NJ. We’d like to address the most common reasons we encounter for cooling systems that smell stale and musty, as well as what you can do about this issue. 

1. Moisture Buildup Is Creating the Perfect Environment for Mold in Your Lakehurst Home

Plain and simple, moisture buildup inside your cooling system is a top cause of foul smells. As your air conditioner removes humidity from the air, it collects water on the evaporator coil, which should then drain away. But if the drain line clogs up or the pan isn’t draining properly, that water will sit and stagnate. These are the prime conditions for mold growth.

In Lakehurst homes, especially those with older cooling systems or units that aren’t serviced regularly, this kind of stagnant moisture is common. Our humid coastal climate means that even a small drainage problem can quickly turn into a mold breeding ground.

What To Do:

Have your local expert technician inspect and clean the condensate drain line and drain pan. Regular AC unit cleaning ensures water doesn’t collect and promote harmful growth. 

2. A Dirty Evaporator Coil Could Be the Culprit

Your cooling system’s evaporator coil absorbs heat and humidity from inside your home. Over time, dust, pollen, and debris get stuck to its damp surfaces. An AC smells musty, while that layer of grime hurts efficiency because it acts as an insulator. And, it also provides food and growing space for mold and mildew.

When air passes over a contaminated coil, it picks up that musty smell and distributes it throughout your living space.

What To Do:

Your local HVAC system expert will check and professionally clean this essential component during regularly scheduled professional maintenance. If you haven’t had your coil inspected recently, it’s time to call in your local technician.

3. A Clogged Air Filter Is Stifling Airflow

Changing your air filter can be easy to overlook, but it plays a big role in your indoor air quality. Clogged air filters restrict airflow, causing cool, damp air to sit in the system longer than it should. This stagnant air promotes the growth of hazardous and unpleasant-smelling mold and mildew.

In Lakehurst, where pollen and outdoor allergens are common in spring and summer, your HVAC system filter may clog faster than you expect.

What To Do:

Check your filter at least every 30 days. If it looks dirty or you can’t see light through it, replace it. Under any circumstances, change it no less than every 90 days.  

4. Mold in Air Ducts Is Spreading the Smell

If there’s mold growth deep inside air ducts, your cooling system becomes a vehicle for spreading musty air throughout every room of your house.

Ducts are dark and can trap moisture from condensation or leaks, especially in older homes or those without sufficient insulation.

What To Do:

If your AC smells musty, a professional duct inspection can lead to duct cleaning to eliminate the problem and prevent it from returning. Sealing leaky duct joints and adding insulation can help over the long term.

5. You’ve Got Mildew in Vents

While mold tends to thrive deeper in the system, mildew in vents is also a common issue. If your vent covers are located in your basement or near windows where moisture accumulates, mildew can grow directly on the surface. This makes the odor especially noticeable when the system first kicks on.

What To Do:

Remove vent covers and clean them with a mild detergent. If you notice black or green growth in or around the ducts themselves, order a professional cleaning.