Under normal conditions, standard-use residential ducts (HVAC systems) should be cleaned every three to five years. Usage, system age and condition, local air quality, and number of residents and pets can affect cleaning frequency needs. Harsher conditions might require cleaning as often as every two years. Obviously, if your system is not functioning properly or the output air quality is bad, consult a professional sooner rather than later to get a proper diagnosis.
You should also have air ducts cleaned after recent water contamination or water damage to prevent mold; after renovations or remodeling to ensure debris and dust didn’t settle in the vents and ducts; if you are having problems with allergies or asthma; or when you are moving into a newly purchased home, especially if the previous owners smoked or had pets. The National Air Duct Cleaners Association (NADCA) recommends getting your air ducts cleaned every three to five years, or every two to three years in regions where homeowners use their air conditioning and heater for many months of the year, while the EPA suggests homeowners have duct cleaning done as needed.
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