Duct cleaning is a relatively new industry that has exploded alone in the 21st century with annual sales. Some people see air duct cleaning as a useful service while others criticize the service and see it as a waste of time and money.
However, it is quite possible that people with differing views for and against the service are right in one way or another on this issue. It is recommended that your HVAC duct systems should be maintained and clean regularly. You can read more reviews about duct cleaning and its maintenance from various online sources.
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The two most common methods for cleaning air ducts are the "contact cleaning" method and the "strong vacuum air wash" method for cleaning the airways.
In general, companies that use this type of cleaning charge less for their services, knowing that they have less dirt, grime, and debris from the drains and that they can usually be in your home for an hour.
Duct cleaning services aren't usually used with this cleaning method but can come in handy when the vent shoes are actually full of construction debris or dog food or anything you don't want to clean just hire a cheap service provider to do the job for you instead.