What Is Dirty Sock Syndrome in HVAC Systems?

Dirty Sock Syndrome is just what it sounds like. It’s when your HVAC system starts blowing air that smells like old, sweaty gym socks in Burleson, TX. This funky odor typically occurs when you first turn on your air conditioner or heat pump, especially during the spring or fall. What you’re smelling is organic growth that has built up on the indoor evaporator coil.

Why It Happens

Your HVAC system pulls in warm, humid air from inside your home to cool it down. When that moisture-filled air hits the cold evaporator coil, it creates condensation. If there’s any dust or grime on the coil, it can become a breeding ground for biological growth. That’s what causes that sour, sock-like smell.

Common Signs You’re Dealing with Dirty Sock Syndrome

• You smell a musty or sour odor when your system first kicks on
• The smell fades after a few minutes but keeps coming back
• You’ve recently switched from heating to cooling
• You live in a humid climate

How to Fix It

• Get a Professional Cleaning: A licensed HVAC technician can safely clean your evaporator coil and get rid of the bacterial buildup.
• Install a UV Light: Adding a UV light inside your HVAC system can help kill organic growth before it spreads throughout your home.
• Change Your Air Filter: A dirty air filter can make things worse. Cleaning or changing it regularly keeps airflow clean and reduces buildup.
• Schedule Regular Maintenance: Keeping up with routine HVAC tune-ups can help you catch these issues early and avoid future problems.

How to Prevent It

• Use a high-quality air filters and change it often
• Get your HVAC system professionally cleaned at least once a year
• Consider installing a whole-home dehumidifier if your house tends to stay humid
• Keep your supply and return vents open, clean, and clear of obstructions

Call NexGen Heating & Air Conditioning Today

If your HVAC system smells like dirty socks, don’t ignore it. That odor is more than just unpleasant. It’s a red flag that your system needs attention. Taking care of this musty smell not only makes your home more pleasant, but also helps protect your indoor air quality and overall health.