Professional air duct cleaning is not cheap and ranges in cost between $400-$750
What to avoid
Don’t hire a duct cleaner that makes sweeping claims about health benefits or claims to be EPA-certified for duct cleaning: That agency offers no such certification.
Shop for a good price, but avoid companies that advertise specials under $200, or even under $100. Known in the industry as “blow-and-go” outfits, they will likely just hook up a vacuum to part of your duct system and do a poor job. Or use the low price as a bait-and-switch tactic. If the deal sounds too good or you have a bad feeling you should trust your instincts.
NADCA members must subscribe to the NADCA code of ethics. More importantly, they must employ at least one NADCA-trained-and-certified technician and employ NADCA-approved methods. Members must also carry at least $500,000 in liability insurance.
Suggestions for Choosing a Duct Cleaning Service Provider
Get several companies to come to your home to perform inspections and provide estimates. Ask them to perform the inspection while you are present. Inspections might consist of only a flashlight and mirrors or involve inserting a video camera into the ducts. Ask them to show you the contamination that would justify having your ducts cleaned.
Confirm that the cleaning will cover the entire system. A cleaning should include supply duct work, return duct work, supply plenum (chamber), return plenum, and all registers and grilles. You may agree, for a reduced price, to exclude the blower fan assembly, heat exchangers, evaporator coils, and collector pans if those are serviced under a maintenance plan with a heating and air-conditioning contractor. But these are the elements most relevant to system efficiency and should be explicitly listed by the duct-cleaning company unless you have agreed to exclude them.