Air duct cleaning scams to avoid: cheap specials, fake mold and upsells

Updated November 10, 2026 · KeystoneProGuide editorial team

What is the most common air duct cleaning scam?

The bait and switch: a very low advertised price for cleaning the whole house, followed by a much larger bill once someone is inside. NADCA, the industry's trade association, calls the companies that do this blow-and-go operators. They advertise low prices, deliver minimal cleaning, then try to sell extra services that may not be needed.

State attorneys general have taken such companies to court, and their findings show how the scheme works. No business is named in this guide.

How does the low-price offer work?

New Jersey. A court ordered two duct cleaning companies to pay more than $1.7 million in civil penalties and more than $68,000 in restitution. According to the state, many customers had answered direct-mail coupons offering whole-house duct cleaning for $37.95 to $69.95. The state alleged that the companies often did not do the work at that price, used the coupons to bait buyers into higher-priced services, and in many cases damaged homes. It identified more than 1,200 violations affecting 98 consumers who complained.

Washington State. A court ordered duct cleaning companies and their owner to pay $10 million in civil penalties over deceptive advertising and more than 13 million robocalls made from 2017 to 2019. Their mailed coupon advertised $29 to $55 without disclosing that only half of the heating and cooling system was included, and called itself a limited-time offer although it carried no expiry date. The court also found that the companies disguised their caller ID with local-sounding names and that one posted fake online reviews.

For scale, the U.S. Environmental Protection Agency (EPA) says duct cleaning typically, though not always, costs $450 to $1,000 per system. NADCA says very cheap whole-house specials often cover only part of the system and may leave out the air handler, blower fans, coils, registers or access openings.

How does the mold scare work?

Someone arrives for a cheap cleaning or an inspection and reports mold. NADCA lists as a common red flag being told, without proper inspection, that mold or other dangerous substances are present.

Pennsylvania has a recent example of where a mold claim can lead. In May 2026 the Attorney General announced that an HVAC company and two employees had agreed to pay $300,000 to settle a lawsuit alleging deceptive, high-pressure sales. According to the office's account, a 90-year-old customer testified that he called about an advertised cleaning special, that the company removed his unit saying it contained mold, and that he signed a contract of about $29,000 for a new one. The settlement bars the defendants from, among other things, calling a substance mold without confirming it by laboratory testing. The office notes that a settlement is not an admission of a violation of the law.

The EPA's guidance supplies the counter. Ask to be shown the mold. Only an expert can positively identify it, and a laboratory test of a tape sample costs about $50. A petri dish that grows something proves nothing, the EPA says, because some microorganisms are always in the air.

What do scam ads look like online?

Michigan's Attorney General warned in 2023 about duct cleaning ads in social media groups and on neighborhood platforms that suggest a neighbor has used the service, which is sometimes untrue. The red flags it lists for such posts are these:

• the post says it is not a scam;
• no company name is given;
• the name is generic and cannot be found online;
• the account is new, or its name does not match the user name in its web address;
• the account is locked, so you cannot see its posts, followers or pictures.

The same warning describes what can follow the booking: unnecessary add-ons such as costly repairs or mold removal and, in some cases, dirt blown out of the system onto drapes, carpets and furniture.

What other tactics should you watch for?

• Health promises. The EPA says not to hire duct cleaners who make sweeping claims about health benefits. Such claims are unsubstantiated.
• A claim to be EPA certified. The EPA does not certify, endorse or approve duct cleaning companies.
• False NADCA membership. NADCA says some companies claim membership or use its logo without the right to. Check its directory.
• Chemical add-ons sold on the spot. The EPA says research has not demonstrated the effectiveness of biocides and sealants in duct cleaning.
• Pressure. The Federal Trade Commission's general list of home improvement scam signs includes pressure for an immediate decision, demands to pay everything up front or in cash only, and callers who knock because they say they are in the area.

How do you protect yourself?

• Get the total price in writing before the job starts. That was the advice of New Jersey's consumer affairs director to anyone buying on a coupon, and the EPA says the same of any duct cleaning job.
• Ask what the price covers, component by component.
• Look the company up. In Pennsylvania a home improvement contractor's registration can be checked in the Attorney General's contractor search.
• Hold back the final payment. The Federal Trade Commission's general advice is not to pay in full up front and not to make the final payment until the work is done and you are satisfied.
• Refuse work you did not ask for. NADCA says these companies may persuade consumers to pay for unneeded services.

What can you do in Pennsylvania if it happens to you?

• Report it. The Office of Attorney General accepts consumer and scam complaints online.
• Stop the calls. You can put your number on Pennsylvania's Do Not Call list online or on 1-888-777-3406, and file a complaint if telemarketing calls continue.
• Cancel quickly. For home improvement contracts, the Attorney General says a Pennsylvania Supreme Court ruling confirms you can cancel within three business days of signing by any means, including by phone, as long as the contractor actually receives notice. Whether a cleaning-only job counts as a home improvement is something the state's guidance does not settle. The Pennsylvania rules guide explains.
• Tell the trade body. NADCA takes reports of companies that falsely claim membership.

Honest pricing is covered in the cost guide, and how to choose an air duct cleaning company sets out the checks to make before anyone comes to the house.

Sources

1. Avoid the Scams, National Air Duct Cleaners Association (NADCA)
2. Cost & Time Estimates, National Air Duct Cleaners Association (NADCA)
3. FAQs, National Air Duct Cleaners Association (NADCA)
4. NJ Division of Consumer Affairs Prevails in Suit Against Duct Cleaning Companies, New Jersey Office of the Attorney General
5. Judge orders $10 million in penalties for AG Ferguson's robocall lawsuit, Washington State Office of the Attorney General
6. AG Nessel Warns Michigan Residents About Air Duct Cleaning Scams, Michigan Department of Attorney General
7. Lehigh Valley HVAC Company to Pay $300K and Revise Business Practices After AG Sunday Lawsuit for Aggressive, Deceptive Sales Practices, Pennsylvania Office of Attorney General
8. Should You Have the Air Ducts in Your Home Cleaned?, U.S. Environmental Protection Agency
9. How To Avoid a Home Improvement Scam, Federal Trade Commission
10. Home Improvement Contractor Search, Pennsylvania Office of Attorney General
11. Submit a Complaint, Pennsylvania Office of Attorney General
12. Do Not Call List, Pennsylvania Office of Attorney General
13. PA Supreme Court Upholds Consumer Right-to-Cancel Home Improvement Contracts Within Three Days Regardless of Medium, Pennsylvania Office of Attorney General