We'll be blunt about our own industry: duct cleaning has a scam problem serious enough that the FTC maintains consumer guidance specifically about it. The good news for homeowners is that the playbook is short — nearly every operation runs some combination of the same seven plays. Learn them once and you're effectively scam-proof.
The seven plays
- The too-cheap coupon. $59–$99 for a "whole house" — a price that can't cover a real crew and real equipment for a multi-hour job. The coupon isn't the product; your living room is. Once inside, the price climbs through the plays below.
- Invented mold. The tech shines a flashlight, looks grave, and announces mold — sometimes aided by a swab "test" performed on the spot. Real mold identification requires laboratory analysis, per the EPA's testing guidance. A same-visit mold diagnosis followed by a same-visit remediation quote is the scam's signature move.
- Blow-and-go. A shop vac at the registers, 30 minutes of noise, an invoice. No trunk connection, no agitation, no negative pressure — which means no actual cleaning. The methods comparison shows what legitimate equipment looks like.
- Phantom certifications. Logos are free to paste on a website. NADCA membership is verifiable in the official directory in under a minute — an unverifiable certification claim is worse than none.
- Bait-and-switch pricing. The phone price and the arrival price are different numbers, reconciled by per-vent surcharges, "main line fees," and fuel charges invented in your driveway. The counter is an itemized written quote before anyone rolls a truck.
- Scare-tactic health claims. "Your family is breathing this" plus stock photos of filthy ducts that aren't yours. The EPA's actual position is measured — cleaning is warranted for specific conditions, not as an emergency health intervention sold at the door.
- The untraceable outfit. Door-to-door or robocall origin, no physical local address, no insurance certificate, cash preferred. If you can't find where they park the trucks, you can't find them after the job either.
The universal counters
- Never buy duct cleaning from an inbound call, a door knock, or a coupon price
- Require an itemized written quote priced on your actual vent and system count
- Verify NADCA membership in the directory yourself — don't take the logo's word
- Insist on before-and-after photos of your own ducts as the deliverable
- Treat any same-visit mold diagnosis as a walk-away signal
- Pay after the photo review, never in full up front
If someone's already quoted you
Suspicious quote in hand? Get it checked before you spend. Our free second opinion exists for exactly this — we inspect, photograph, and tell you what your system actually needs, including when the honest answer is "nothing yet." For the positive version of this article — what a trustworthy company looks like — see the 10-point vetting checklist and the full buying guide.
Frequently asked questions
A company found mold in my ducts during a $99 cleaning. What should I do?
Don't authorize anything on the spot. Visual 'mold diagnosis' during a coupon visit is the single most common upsell play — actual mold identification requires lab analysis, per EPA guidance. Get the claim in writing, then get an independent second opinion; ours is free and comes with photos.
Are the $99 whole-house duct cleaning coupons ever legitimate?
A whole-home source-removal cleaning takes a trained crew, sealed negative-air equipment, and several hours — the math doesn't work at $99. The coupon's real function is getting a salesperson inside your home, where the price grows via 'discovered' problems and per-vent surcharges.
What if I already paid a company I now suspect scammed me?
Document everything — invoice, any photos, what was claimed versus done. Dispute the charge with your card issuer if the work was misrepresented, report the company to the FTC and your state attorney general, and get an independent inspection to establish your system's actual condition.