How to choose an air duct cleaner without getting burned
The EPA publishes a consumer guide on hiring a duct cleaner, and it is blunter than most companies would like. Get at least three written estimates, ask to be shown the contamination that justifies the job, refuse health claims and routine-maintenance pitches, and check the work afterward with a flashlight and a checklist. This guide turns that into a short list you can use at the door.
By Steve · Published October 20, 2026
The short answer
- Get at least three written estimates, and a written agreement with the total cost and scope before work begins.
- Ask to be shown the contamination that justifies cleaning. If they cannot show you any, that tells you something.
- Walk away from health claims and from anyone who calls duct cleaning routine maintenance. The EPA says both are unsubstantiated.
- The EPA does not certify, endorse or approve duct cleaning companies. A company claiming EPA certification is a red flag.
- Verify the job afterward: a visual check of every component, and a flashlight test through the cooling coil.
Start with the EPA’s own position
Before you compare companies, know what the EPA says about the job itself. It does not recommend cleaning ducts routinely, only as needed. It says duct cleaning has never been shown to actually prevent health problems. And it lists the conditions that justify cleaning: substantial visible mold growth inside hard-surface ducts, vermin in the ducts, or ducts clogged with excessive dust and debris, including particles being released from the supply registers.
If a company’s pitch does not start from one of those, ask why. Our own guide on whether duct cleaning is worth it goes through the same list for a Phoenix home.
Before you hire anyone
Get three written estimates. The EPA says to talk to at least three providers and get written estimates. Ask for the total cost and scope in writing before any work starts. If the price is hourly, ask for an estimate of the hours or days and whether there will be interruptions.
Ask to be shown the problem. The EPA says to ask providers to show you the contamination that would justify cleaning. This is the most useful single question on the list. A company that cannot show you a reason has told you what it is selling.
Refuse health claims. The EPA says not to hire cleaners who make sweeping claims about health benefits, and not to hire those who recommend duct cleaning as routine maintenance. The advertised bargain price is a related trick, which we explain in the duct cleaning scams guide.
Be wary of “EPA certified.” The EPA states that it does not set duct cleaning standards and does not certify, endorse or approve companies. Anyone claiming otherwise is misrepresenting it.
Understand biocides and sealants. The EPA says not to allow chemical biocides or chemical treatments unless you fully understand the pros and cons. If someone proposes spraying or sealing the inside of your ducts, ask for the product label and the reason in writing.
Check references and complaints. Ask for references from customers who had no problems afterward. The EPA also suggests contacting your city or county consumer affairs office or the Better Business Bureau.
What a proper job involves
The EPA lists what the provider should do: open access ports so the entire system can be cleaned and inspected, protect carpet and furnishings, use vacuum equipment that exhausts outdoors (or HEPA if it exhausts inside), use well-controlled brushing together with contact vacuum cleaning, and seal and re-insulate any access holes so they are airtight. For fiberglass duct board and fiberglass-lined ducts, it says to use soft-bristled brushes only.
Our own method is on the duct cleaning process page. It follows the same logic: continuous suction under negative pressure, agitation of every run, and a tool matched to the duct material.
How to check the job
The EPA says a thorough visual inspection is the best way to verify cleanliness. Show the provider its checklist before work begins, and afterward ask them to show you each component.
Some of its checks are easy to do yourself:
- Interior duct surfaces should be free of visible debris at several random spots on both the supply and return sides.
- Both sides of the cooling coil should be visibly clean. Point a flashlight into the coil. If it is clean, light should shine through the other side.
- Coil fins should be straight and evenly spaced, and the coil drain pan should be clean and draining.
- Blower blades and the blower compartment should be free of oil and debris.
- Any access holes the provider made should be sealed airtight and re-insulated.
If any answer is “no,” ask the provider to correct it until every answer is “yes.”
What we do differently
We publish the price. $449 covers one system with up to 12 supply vents, and the exact number is confirmed at the door. Every job produces before-and-after camera footage from inside the ducts, so the EPA’s “show me” test is built in. See how a visit works and our standards for the details. If the system is young and none of the EPA’s conditions apply, we will tell you to skip it.
The services this guide is about
Common questions
- How many quotes should I get?
- The EPA says to talk to at least three different service providers and get written estimates before deciding whether to have your ducts cleaned.
- What should I ask the cleaner to show me?
- The EPA says to ask them to show you the contamination that would justify cleaning. It also says, for mold, that many parts of the system cannot be seen without access, so ask the provider to show you any mold they say exists.
- Should I hire someone who says duct cleaning is routine maintenance?
- No. The EPA says not to hire duct cleaners who recommend duct cleaning as a routine part of heating and cooling maintenance, and not to hire those who make sweeping health claims, because such claims are unsubstantiated. The EPA's own position is that ducts should be cleaned as needed, not routinely.
- Is there an EPA certification for duct cleaners?
- No. The EPA says it neither establishes duct cleaning standards nor certifies, endorses or approves duct cleaning companies, and that you should be wary of anyone claiming to be certified by EPA.
- What should the cleaner use?
- The EPA says vacuum equipment that exhausts particles outside the home, or HEPA equipment if it exhausts inside, with well-controlled brushing of duct surfaces together with contact vacuum cleaning. It names soft-bristled brushes for fiberglass duct board and fiberglass-lined sheet metal.
- How do I check the work afterward?
- The EPA says a thorough visual inspection is the best way, and some providers use remote photography to document conditions. Its checklist includes shining a flashlight into the cooling coil to see whether light comes through the other side, and checking that interior duct surfaces are free of visible debris at several random points.
- What does a standard duct cleaning cost with you?
- $449 for one system with up to 12 supply vents, $25 for each extra vent and $299 for each extra system. The price is confirmed at the door before any work starts.
Sources
- Should You Have the Air Ducts in Your Home Cleaned? — U.S. Environmental Protection Agency. EPA 402-K-97-002, October 1997. Source for every EPA recommendation on this page. Accessed October 20, 2026.
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