Beware of Common Air Duct Cleaning Scams. 4 red flags, and what an honest estimate looks like.
Rock-bottom ads, surprise upsells, rushed jobs and scare tactics cost Denver homeowners money and can leave the work half done. Here is how Denver Pros Cleaning Services sees the four most common air duct cleaning scams, and what an honest estimate looks like.
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“I have Denver Pros clean my dryer vent and ductwork yearly. They do a quick, thorough cleaning. This is for safety as well as helping the dryer work better.”
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“We have used Denver Pros twice now and couldn’t be happier with their team and the results. Bryan (our tech) was very transparent and informative on what to expect and why and worked VERY hard to get us the best results possible. I highly recommend Denver Pros and Bryan.”
Air duct cleaning scams usually follow one of four patterns: a rock-bottom advertised price, a surprise upsell once the crew is inside, a rushed “blow-and-go” job, or scare tactics meant to pressure you into signing. Denver Pros Cleaning Services explains each one below, along with the question that helps you spot it.
Too-good-to-be-true whole-house prices
Bait-and-switch upsells
Blow-and-go quick jobs
Scare tactics and fake evidence
Updated October 2026
Know the signs
4 common air duct cleaning scams, and how to avoid them
Each one comes with a simple question. Ask it before you book.
1. The too-good-to-be-true price
How it works: An ad offers whole-house air duct cleaning for $49, $79 or $99, often with “unlimited vents.” The low number is there to get a technician through your front door.
What’s really going on: Thorough cleaning with powerful negative-pressure equipment takes real time, skilled labor and costly equipment, and a bargain price can’t cover that. Once the crew is inside, the price usually has somewhere to go: add-ons, extra charges, or a quick job that doesn’t clean the whole system.
Ask: What exactly does this price include, and what would make it go up?
2. The bait-and-switch
How it works: After the crew arrives, they announce a serious problem, such as heavy soot or a complete blockage, that the advertised price “doesn’t cover,” and offer an expensive upgrade on the spot.
What’s really going on: A reputable company explains how it prices the job before it starts and puts the estimate in writing. A surprise isn’t a reason to rush your decision. If something unexpected comes up, you should be able to see it yourself, ask questions and take time to decide.
Ask: Can you show me what you found and put the new price in writing so I can think it over?
3. The blow-and-go
How it works: The crew spends 20 to 30 minutes in your home, blows air or runs a small vacuum near your registers, and leaves.
What’s really going on: A whole-system cleaning takes hours. At Denver Pros Cleaning Services, an average home usually takes about 4 to 6 hours. A job that finishes in minutes is cleaning the ends of the vents, not the main trunk lines or the blower.
Ask: How long will this take, and which parts of the system will you clean?
4. Scare tactics and fake evidence
How it works: A technician pulls out a generic “air tester,” announces alarming results, or shows you scary photos of dirty ducts that may not even be from your home.
What’s really going on: The goal is to make you panic and sign on the spot. Honest professionals encourage you to verify before you pay: ask for physical proof you can see in your own home, and consider a second opinion.
Ask: Can you show me this in my own ductwork and put your findings in writing?
What the bait looks like
Ads and posts to be careful with
If a price looks too good to be true, ask what the final total will be. Tap an image to see it full size.
Side by side
An honest estimate vs. a bait-and-switch estimate
Use this as a checklist when you compare companies.
A straightforward company
A scam operator
The price
A clear total, confirmed in writing
A tiny whole-house price that grows on-site
What gets cleaned
All supply and return ducts, registers and the main system parts, as listed in the estimate
A quick pass over the vent covers
Time on the job
Several hours for an average home
Done in minutes
The estimate
In writing, with inclusions and exclusions
A verbal number, or none
Urgency
Explains what they see and gives you time to decide
Scare tactics and pressure to sign on the spot
Proof
A real address, public reviews and proof of insurance
A generic name and nothing you can check
Social media
How to spot a social media duct cleaning scam
Neighborhood groups and marketplace posts are a common place for these offers.
The post hides the company name and asks you to message privately. Legitimate businesses want their name public.
The name is generic, like “Duct Cleaning in your city,” and impossible to trace online.
A local address and phone number are listed, but they can’t be found in search results.
The account is brand new, which is one of the easiest red flags to spot.
The profile is locked down: no friends, posts or photos you can see.
No reviews from real customers that you can check somewhere else.
“BEWARE! The ‘BEST PRICE’ almost always fails to deliver the best quality… Period!”
Oscar, Denver Pros Owner
Qualify your pro
13 questions to ask any duct cleaning company
A trustworthy company answers these easily. Get the answers, and the estimate, in writing.
What is your business’s physical address and phone number?
What is your website and email address?
How many years of experience do you have?
What cleaning method do you use?
Are all the vents and returns included?
Do you clean both trunk lines, the furnace and the plenums?
What is the approximate time of completion?
What is excluded from your quoted amount?
What extra fees or charges should I be aware of?
Could you email me a written estimate?
Do you subcontract your jobs?
Could you email me proof of liability insurance?
What is your guarantee?
BEFOREAFTER
Real Denver Pros air duct job. Drag the slider to compare.
Real results
What a real duct cleaning looks like
A proper cleaning removes built-up dust and debris from inside the system, not just the vent covers. Watch our crew at work below.
Air Duct Cleaning in Aurora, COBefore & after: dust and debris removed
A 56-second video of Denver Pros cleaning air ducts in Aurora, CO.
How Denver Pros works
What an honest air duct cleaning looks like
Here is how Denver Pros Cleaning Services quotes and cleans, so you have something to compare.
Custom, written quotes
We quote each home individually, based on your property’s size and the number of HVAC systems or furnaces, and provide the estimate in writing.
Whole-system cleaning
Our all-inclusive cleaning covers all supply and return ducts, registers and grilles, the plenum, the HVAC blower motor and housing, and the drip pan.
Negative-pressure, push-pull method
A high-power vacuum holds the system under negative pressure while rotary brushes and whip agitation tools loosen buildup from the duct walls.
Real time on site
An average home usually takes about 4 to 6 hours, because a thorough cleaning isn’t a quick pass.
Insured and verifiable
Denver Pros maintains general liability insurance and can provide proof of insurance and references on request. Hundreds of reviews are public on Google.
Local and owner-led
Family-owned and based in Aurora, serving Denver Metro since 2008.
Every job is backed by our 30-day satisfaction guarantee and on-time arrival guarantee, per our terms and conditions.
The four most common are the too-good-to-be-true price (whole-house specials of $49, $79 or $99), the bait-and-switch (a surprise problem and an expensive on-the-spot upgrade), the blow-and-go (a 20 to 30 minute job near your registers), and scare tactics with fake evidence meant to pressure you into signing.
How can I tell if an air duct cleaning price is too good to be true?
Be cautious of whole-house prices such as $49, $79 or $99. A thorough cleaning takes hours of skilled work and professional equipment. Ask what the price includes and what could raise it. Denver Pros Cleaning Services quotes each home individually, based on property size and the number of HVAC systems or furnaces.
How long should a proper air duct cleaning take?
Longer than a quick pass with a vacuum. At Denver Pros Cleaning Services, an average home of about 2,000 to 3,000 square feet with one or two HVAC units usually takes about 4 to 6 hours. Larger homes and complex layouts take longer.
What should an honest air duct cleaning estimate include?
A written estimate that lists which parts of the system are included, such as supply and return ducts, registers and grilles, the plenum, the blower motor and housing, and the drip pan, along with anything excluded, the total price and the expected time on site.
What should I do if a technician pressures me to sign on the spot?
Don’t sign. A reputable company gives you time to decide. Ask for the estimate and what’s included in writing, compare it with other quotes, and walk away from anyone who rushes you.
Does Denver Pros provide proof of insurance and references?
Yes. Denver Pros Cleaning Services maintains general liability insurance and can provide proof of insurance and references on request, and hundreds of reviews are public on Google. Colorado does not require air duct cleaning companies to hold a state license, so insurance, references and reviews are the best way to vet a company.
What should I do if I think I’ve been scammed?
Keep the estimate, receipt and photos, and ask the company to correct the problem in writing. If that doesn’t work, you can file a complaint with the Colorado Attorney General’s consumer protection office and the Better Business Bureau, and ask your card issuer about disputing the charge.
What guarantees does Denver Pros offer?
Per our terms and conditions, every job is backed by a 30-day satisfaction guarantee and an on-time arrival guarantee.
Where can I learn about Denver Pros air duct cleaning?
How to spot a social media duct cleaning scam
Neighborhood groups and marketplace posts are a common place for these offers.