How Often Should You Clean Your Air Ducts in Los Angeles?

It’s one of the most common questions we get: “How often do I actually need to clean my air ducts?” The honest answer is that it depends on where you live and how your home operates — and if you’re in Los Angeles, the answer is likely more often than the national guidance you’ll find online.

The General Rule (and Why LA Is Different)

Most national HVAC guidance recommends duct cleaning every 3–5 years for the average home. But Los Angeles isn’t the average home environment. Between seasonal wildfire smoke, dense freeway particulate matter, and HVAC systems that run nearly year-round (AC in summer, heat in winter), local ductwork accumulates buildup meaningfully faster than in milder, less polluted regions.

For most LA homes, we recommend air duct cleaning every 2–3 years as a starting baseline — with several common factors that can shorten that window.

Factors That Mean You May Need Cleaning Sooner

• Pets in the home — pet dander and hair accumulate in ductwork faster than typical household dust
• Recent renovation or construction — construction dust gets pulled directly into HVAC systems
• Wildfire smoke exposure — homes near recent wildfire activity often see heavier duct buildup
• Allergy or asthma symptoms at home — if symptoms are noticeably worse indoors, ducts may be circulating allergens
• Homes near major freeways — the 405, 10, and 101 corridors in particular see heavier particulate exposure

Signs Your Ducts Need Cleaning Right Now

Regardless of how long it’s been, certain signs mean it’s time for a cleaning regardless of the calendar:

• Visible dust blowing out of vents when your HVAC system turns on
• A musty or stale smell when the system runs
• Noticeably worse allergy symptoms at home than elsewhere
• Uneven heating or cooling between rooms

The Bottom Line

If it’s been more than 2–3 years since your last professional cleaning — or you’re noticing any of the warning signs above — it’s worth scheduling an inspection. Kevin Air Duct offers free estimates across Los Angeles County, so there’s no cost to find out where your home stands.