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. Camera inspection before and after. Trunks, plenums and the furnace coil 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.