How to Spot a $99 Air Duct Cleaning Scam: Blow-and-Go Red Flags

The ads look the same everywhere: "Whole-house air duct cleaning, $99!" They show up in mailers, social media feeds, coupon sites and daily-deal offers. Some homeowners book one and get an honest, limited service. Others end up with a crew that spends an hour in the house and then presents a much bigger bill. Here is how to tell the difference, using guidance from the National Air Duct Cleaners Association (NADCA), the U.S. Environmental Protection Agency and the Nevada State Contractors Board (NSCB).

Is air duct cleaning a scam?

Not by itself. EPA says cleaning makes sense when there is visible mold in hard ducts, a pest infestation, or ducts "clogged with excessive amounts of dust and debris." See is air duct cleaning worth it? for the full picture. The scam is in how some companies sell it: a price that cannot cover a real job, used to get a crew into your house.

Why $99 cannot pay for a whole-house cleaning

EPA says duct cleaning services "typically — but not always — range in cost from $450 to $1,000 per heating and cooling system." NADCA's cost page gives the same broad range for an average-sized home, "often between $450 and $1,000." National cost guides report averages of about $389 (HomeAdvisor, 2026) to $500 (Fixr, 2026). These are estimates, but they show the gap. A thorough job means a crew, a powerful vacuum that keeps the system under negative pressure, brushes or air whips, and several hours of work. Our air duct cleaning cost guide breaks down typical ranges by vent count and home size.

NADCA explains what usually happens with very cheap offers: "Homeowners should be cautious of advertisements promoting extremely low-cost 'whole house' air duct cleaning specials. These offers often include only limited portions of the system and may exclude critical components such as the air handler, blower fans, coils, registers, or necessary access openings."

What NADCA says about "$99 whole house specials" and blow-and-go companies

NADCA's consumer FAQ is blunt: "Avoid advertisements for '$99 whole house specials' and other sales gimmicks."

It also names the pattern: "Consumers should also beware of 'blow-and-go' air duct cleaning companies. These companies often charge a nominal fee and do a poor job of cleaning the heating and cooling system. These companies may also persuade the consumer to pay for unneeded services with and/or without their permission." On its scam page, NADCA adds that these companies "often advertise low prices but deliver minimal cleaning, then attempt to convince homeowners to purchase additional services that may not be needed."

State officials have issued similar warnings. In December 2023, Michigan's attorney general warned that blow-and-go companies use "rock bottom prices to hook customers and then will add on unnecessary services, like costly repairs or mold removal." A FOX 5 DC report described a "$99" ad whose bill "ballooned" to nearly $6,000. Closer to home, KTNV in Las Vegas ran a hidden-camera investigation into whether duct cleaning ads are too good to be true.

Red flags to watch for

• A "whole house" price far below $450. NADCA warns these offers often leave out the air handler, blower, coils or registers.
• Sudden mold findings. EPA tells homeowners to "ask the service provider to show you any mold they say exists." If a crew says it found mold, ask to see it.
• Health promises. EPA: "Do not hire duct cleaners who make sweeping claims about the health benefits of duct cleaning — such claims are unsubstantiated." Duct cleaning "has never been shown to actually prevent health problems."
• "You need this every year." EPA also says not to hire "duct cleaners who recommend duct cleaning as a routine part of your heating and cooling system maintenance." See how often to clean air ducts.
• "EPA certified." EPA does not certify duct cleaners. In its words, "You should also be wary of duct cleaners who claim to be certified by EPA. Note: EPA neither establishes duct cleaning standards nor certifies, endorses, or approves duct cleaning companies." A claim of EPA certification is false.
• Heavy chemical upsells. Sanitizers and "fogging" are regulated as pesticides. EPA says research "has not demonstrated their effectiveness in duct cleaning," that no biocides are registered for fiberglass-lined ducts or duct board, and that any product should be applied, if at all, only after the system is properly cleaned. Ask to see the label. Whether to ask for a treatment is your choice.
• Pressure to decide now. NSCB: "Don't let a contractor or salesperson rush you into anything."
• Verbal add-ons. NSCB: "Do not engage in verbal agreements for repairs or additional work."
• Just a vacuum hose at one vent. NADCA says "A vacuum collection device alone will not get an HVAC system clean." A real job agitates debris with brushes, air whips or similar tools while the system is under negative pressure. Our source removal guide explains the method.

Nevada's warning about low bids

The Nevada State Contractors Board gives homeowners advice that fits duct cleaning specials well: "Beware of any bid, which is substantially lower than others." It also warns that hiring an unlicensed contractor has real consequences: "If you hire an unlicensed contractor, your contract is null and void by law," unlicensed contractors "do not carry Workman's Compensation insurance," and "Homeowners who use unlicensed contractors are not eligible for the Residential Recovery Fund."

Licensing for duct cleaning in Nevada is less clear-cut than for most trades. Based on our reading of the Nevada Administrative Code (NAC 624.380) and NRS 624, there is no separate duct cleaning license class. HVAC service work generally falls under the C-21 classification, and the C-21b air-conditioning subclass covers the "service and maintenance" of equipment "and related ductwork." Whether pure duct cleaning, with no repairs, needs a license is not settled, and we did not find an NSCB ruling on it. Work such as coil or blower repair, duct sealing and evaporative cooler repair is a different matter. The $1,000 handyman exemption does not cover HVAC-type work: NRS 624.031 excludes work "of a type performed by a plumbing, electrical, refrigeration, heating or air-conditioning contractor." So ask the company directly what license it holds, and check NSCB. This is general information, not legal advice.

Nevada requires contractors to show their license number in their ads; check any company on the NSCB license search before you hire. Confirm the license is active, that the classification fits the work, and that the name matches the company you are dealing with. Our guide to checking a Nevada contractor's license walks through it.

How to protect yourself

• Get written estimates from at least three companies, as EPA recommends, and "ask them to show you the contamination that would justify having your ducts cleaned."
• Insist on "a written agreement outlining the total cost and scope of the job before work begins." Make sure it lists the air handler, blower, coil, every supply and return, and access openings.
• Ask how the company will protect your home. EPA says equipment should exhaust outside or use HEPA filtration if it exhausts indoors.
• If a company says it is a NADCA member, you can confirm it in NADCA's "Find a Professional" directory.
• Look at the result. EPA: "All portions of the system should be visibly clean; you should not be able to detect any debris with the naked eye."
• Remember EPA's advice: "they are trying to sell you a service, so ask questions and insist on complete and knowledgeable answers."

A fair price is not always a high price

Not every low price is a scam. A company may offer a fairly priced partial service, such as a single return line or a dryer vent. The test is whether the written scope matches the price and whether the add-ons are explained before work starts. If an offer says "whole house" and the number is a fraction of EPA's range, that is when NADCA's warning applies. You can read what a full job includes on our process page.

Comparing written quotes is the simplest defense against bait pricing. Get free quotes from local companies and see what a full scope actually costs for your home, or learn more about air duct cleaning in Reno.