About $300 to $450 or more. The average cost to clean a home's air ducts is about $360 to $410, but prices can range from $190 to $500.
Other factors determine the price of the air duct cleaning besides the length of time it takes and what is being done. A one-story house is going to cost less than a two-story.
If more than one person lives in the home, if there is more square footage to be covered, and if you plan to have some of the vents re-covered with insulation, the price will increase. You may also need your dryer vent cleaned out.