Air ducts should generally be cleaned every 3 to 5 years, according to the National Air Duct Cleaners Association (NADCA) and multiple industry experts

. However, the frequency can vary based on specific factors:

• Allergies or asthma: If household members suffer from allergies or asthma, cleaning every 2 to 3 years is recommended to reduce allergens like dust and pollen

• Pets: Homes with shedding pets should also consider cleaning every 2 to 3 years due to pet dander accumulation

• Recent renovations or construction: After home remodeling or construction, ducts should be cleaned to remove dust and debris introduced during the work

• Smoking indoors: Cigarette smoke residue may require more frequent cleaning to avoid stale odors and chemical buildup

• High HVAC usage or poor local air quality: Frequent HVAC use or living near pollution sources can accelerate duct contamination

• Signs indicating immediate cleaning: Visible mold, pest infestation, unusual odors from vents, excessive dust buildup, or higher energy bills can signal the need for prompt duct cleaning

In humid climates like Florida, cleaning may be needed more often due to faster mold and mildew growth

. Regular inspection of ducts is advised at least once a year, with cleaning performed as needed to maintain air quality and HVAC efficiency

. In summary, while the baseline recommendation is every 3 to 5 years, households with allergies, pets, smokers, recent renovations, or other risk factors should clean air ducts more frequently, typically every 2 to 3 years