The industry's own certification body estimates that roughly 80% of duct cleaning companies don't meet basic equipment, training, or business-practice standards. Here's what the scams actually look like — starting with the equipment itself.
Duct cleaning is one of the easiest home services to run a scam on, because most homeowners have no way to check the work themselves — and most scams start with the wrong equipment doing the wrong job.
Before pricing, before sales pitches — the single biggest tell is what's actually parked in your driveway. Duct cleaning isn't one standardized service; it's a wide range of methods, and only some of them are strong enough to actually extract debris from a sealed duct system rather than just stirring it around.
None of this means portable equipment is automatically dishonest — but it does mean a portable rotary-brush unit doing a "whole-home deep clean" for the same claims as a truck-mounted negative-air system is doing a materially different job, whatever it's billed as. Ask what's actually being used before anyone shows up.
A rock-bottom advertised price gets a technician into your home. Once there, the "estimate" balloons — extra vents, a "contaminated" system, a required sanitizing add-on — until the real price is several times the ad. See our real cost breakdown for what legitimate pricing actually looks like.
A technician points a flashlight into a vent, declares they see "mold" or "contamination," and uses that to push an expensive sanitizing treatment — often with no photo, no camera footage, no lab testing.
The crew disappears into the attic or crawlspace, you hear a vacuum running for twenty minutes, and that's it — no before-and-after documentation, nothing to actually verify the ductwork was cleaned rather than just accessed.
If a company won't give you a firm number until the crew is already unloading equipment in your driveway, that's not an estimate — that's leverage. Legitimate pricing is quoted before anyone touches your ductwork.
Truck-mounted, negative-air equipment with 2-stage gas air compressors — never a portable unit or brush-only system passed off as a full clean. QUADCA certified, 1 of only 2 in Idaho, independently verifiable. Flat-rate pricing by square footage, quoted before any work begins. Free camera inspection, before and after. Hospital-grade sanitation included at no extra charge. No hidden fees, no bait-and-switch, 100% satisfaction guaranteed.
Truck-mounted, negative-air cleaning. Free camera inspection. No hidden fees, ever.
No hidden fees. No bait-and-switch. 100% Satisfaction Guaranteed.