The short answer
It depends on the condition of your system. The EPA does not recommend that air ducts be cleaned routinely, only as needed. It suggests considering cleaning when there is substantial visible mold growth inside hard-surface ducts or other components, vermin infestation, or ducts clogged with excessive dust and debris that is being released into the home.
When cleaning is worth it
- After a renovation or new construction that left debris in the system.
- After a pest problem, once the pests and their entry point have been dealt with.
- When dust or debris blows out of the registers when the system starts.
- When an inspection confirms mold on hard surfaces and the moisture source has been fixed.
When it is a waste of money
- When it is sold on a fixed schedule without anyone looking inside the system.
- When the offer promises to cure allergies or other health conditions. The EPA states that duct cleaning has never been shown to prevent health problems.
- When a very low advertised price grows once the technician arrives.
- When the real problem is a leak, a damaged duct or an equipment fault that cleaning does not fix.
What cleaning can and cannot do
Done properly, cleaning removes debris from the ducts and components it covers. The EPA notes that cleaning components such as coils, fans and heat exchangers may improve efficiency, but there is little evidence that cleaning only the ducts does. Ask what the scope includes before comparing prices.
How to avoid paying for the wrong service
- Ask for an inspection and to see the condition of the accessible ductwork.
- Get a written scope that lists every component included.
- Ask whether the provider follows NADCA cleaning standards.
- Question any chemical treatment; the EPA advises understanding biocides and sealants before agreeing to them.
- Compare the scope, not just the price. Our cost guide explains what affects an estimate.
Our approach
We would rather tell you that your ducts do not need cleaning than sell a service you do not need. If an inspection shows a problem, we explain what we found and what the work covers. See our guide to what professional duct cleaning includes, or check our current offers.
