How a Duct Cleaning Scam Usually Works
The script has three steps, and it depends on you not knowing what a real cleaning costs or involves.
| Step | What happens | What it's for |
|---|---|---|
| 1. The bait | A whole-house price far under the local range | Getting the crew inside |
| 2. The scare | Mold, "toxic" dust or pests reported, rarely shown | Creating urgency |
| 3. The upsell | Sanitizing, fogging, extra vents or a "system reset" | Where the real bill comes from |
A whole-system cleaning near Dulles runs about $500 to $800 per system. A quote at a fraction of that usually covers a handful of vents, with the rest priced once the truck is in your driveway. The air duct cleaning guide explains what a full job includes.
Seven Red Flags
A Price That Can't Cover the Work
A whole house for far less than the local range means the scope is smaller than it sounds.
Health Promises
The EPA says not to hire cleaners who make sweeping health claims. Duct cleaning has never been shown to prevent health problems.
"EPA Certified"
The EPA does not certify duct cleaners and tells homeowners to be wary of anyone who claims it.
Cleaning Sold as Routine Maintenance
The EPA advises against cleaners who recommend duct cleaning as a routine part of system upkeep.
Mold You Never See
Ask to see the growth. The EPA says only an expert can confirm mold, and a lab test of a tape sample costs about $50.
"Sanitized" or "Disinfected" Ducts
NADCA says technicians must not claim to sanitize or disinfect ductwork, because no product is 100 percent effective.
A Fogger in the Return
NADCA warns that spraying a fogger into the return doesn't treat the whole system, however much it costs.
More on chemical add-ons, and which ones to decline, is on the air duct sanitizing page.
What a Fair Job Looks Like
Fair Quote
- Written scope and total price
- Every supply and return counted
- Blower, coil and drain pan listed
- Before and after photos
Scam Quote
- Price by phone, no scope
- "Up to" a number of vents
- Health promises
- Chemicals added by default
The questions that separate the two are listed in questions to ask before hiring a duct cleaner.
If You Think It Already Happened
Ask the company for the photos and the product name of any chemical it applied, in writing. The EPA suggests checking with your local consumer affairs office or the Better Business Bureau. Then have the system looked at by someone who didn't do the work, so you know what is actually inside.