How often should my heating and air vents be cleaned?

According to the National Air Duct Cleaner's Association, it should be a rule of thumb to have your vents cleaned and serviced every 3 to 5 years. It would be best to take this as an advice that resulted from multiple experiences of cleaning professionals rather than an exact rule. One thing to note is that if you find your vents needing to be cleaned in just months, There might be an actual problem, and they need to be inspected by a professional.

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