Your air conditioning system keeps your home cool and comfortable—but what about the air you’re actually breathing? Over time, dust, allergens, and even mold can build up in your AC ducts, affecting your air quality, health, and system efficiency. That’s why regular duct cleaning is essential—but how often should it actually be done?

Let’s break it down.

General Recommendation: Every 2 to 3 Years

Most HVAC experts recommend ac duct cleaning every 2 to 3 years. This helps maintain good indoor air quality and keeps your system running efficiently. However, this timeline can vary depending on your environment and lifestyle.

Clean More Often If:

1. You Have Allergies or Respiratory Issues

Dust, pollen, and pet dander can get trapped in ducts and circulate through the air. If someone in your home has asthma or allergies, more frequent cleaning (every 1 to 2 years) can significantly improve comfort and health.

2. You Have Pets

Fur and dander accumulate fast! Homes with multiple pets often need duct cleaning more frequently.

3. You’ve Just Renovated

Construction dust cleaning, drywall particles, and debris can easily find their way into your ductwork. After any major renovation, a thorough duct cleaning is a smart move.

4. You’ve Moved into a New Home

Unless you’re sure the ducts were recently cleaned, it’s a good idea to start fresh in your new space.

5. You Smell Musty Odors or See Mold

If there’s a musty smell coming from your vents, or visible mold around vents or ducts, call a professional right away. Mold can be hazardous to your health.

Signs Your AC Ducts May Need Cleaning

• Unexplained increase in dust around the home
• Weak airflow from vents
• Persistent musty or dirty odors
• Increased allergy symptoms indoors
• Visible debris or dark dust on vent covers
• Insect or rodent droppings in or around ductwork

Who Should Clean Your AC Ducts?

Duct cleaning is not a DIY job—it requires specialized equipment and experience. Hire a certified, professional duct cleaning service to ensure it’s done safely and thoroughly.

The Bottom Line

Your air ducts don’t need constant attention, but ignoring them for too long can impact your health and your HVAC system’s performance. As a general rule, clean every 2–3 years, and sooner if you notice any of the signs above.