It is typically recommended to clean air ducts and vents every 3-5 years, but this varies depending on a variety of factors, such as how often the home is used, the type of air ducts and vents, and the level of contamination. Professional cleaners can help to determine how often your home needs cleaned.

You should hire professionals to clean the vents and air ducts. How often you should clean them depends on a variety of factors, including how much use they get, the type of filtration system in place, and the surrounding environment. Generally, it's recommended to have them cleaned every 6 to 12 months.