Questions to ask a dryer vent cleaning company before you hire

Updated November 10, 2026 · KeystoneProGuide editorial team

What should you ask before hiring a dryer vent cleaner?

Ask about the price, the method, the proof and the paperwork, in that order, and ask every company the same things. The twelve questions below can be covered in one phone call. Each comes with the reason it matters, so you can judge the answer and not just collect it.

What should you ask about the price?

1. Is this a flat price or an hourly one? Fixr says the charge is usually a flat fee based on where the vent is, though some technicians bill $90 to $160 an hour. Know which you are being quoted.
2. What does the price assume about my vent? The published prices turn on where the vent ends, how long it is and how many turns it makes. Angi and HomeAdvisor put a basement or first-floor vent at $80 to $150 and a roof vent at $150 to $250. Describe your vent and ask whether the quote still holds.
3. What would make it cost more on the day? HomeGuide suggests asking what extra costs can apply. The common ones in the cost guides are a nest or heavy blockage, at $120 to $250, and repairs. Get those figures before anyone arrives.
4. Is an inspection included, or charged separately? A separate inspection runs $30 to $60. HomeGuide says some companies waive it when you book a cleaning.

What should you ask about the work?

1. Which parts will you clean? HomeGuide's version of this question names three: the lint trap, the outside vent flap and the inside of the dryer cabinet. The appliance makers' association, AHAM, says a qualified service technician should clean the interior of the appliance as well as the venting system once a year, so it is fair to ask whether the visit covers both.
2. What tools will you use? Angi suggests asking what method will be used to remove the lint. HomeGuide suggests asking whether the vacuum is made for duct cleaning.
3. How will you show me the vent is clear? There are three answers in the published material. HomeGuide suggests an airflow measurement at the outside opening before and after. Angi mentions a camera inspection. NADCA, the duct cleaners' trade association, describes a performance test using a pressurized blower, done only once the duct has been inspected and confirmed clean, and says a video does not replace that test. Any of the three beats no check at all.
4. How long will it take, and how many people are coming? HomeGuide says 30 to 60 minutes is average and up to 2 hours for difficult vents. HomeAdvisor says rooftop vents and extra-long runs sometimes need a two-person crew.

What should you ask about credentials and paperwork?

1. Do you hold a dryer vent credential, and who holds it? The Chimney Safety Institute of America says its Certified Dryer Exhaust Technician credential is the only certification specifically for people who service dryer vents. NADCA tells homeowners to ask whether a technician follows its dryer exhaust standard. Both are industry bodies describing their own programs, and no Pennsylvania source read for these guides requires either. If a company claims one, ask for the name of the certified person and check it with the body that issued it.
2. Are you registered as a home improvement contractor, and what is your number? Pennsylvania's registration law names repair, replacement and installation work priced above $500, not cleaning, and the Attorney General's guidance does not mention dryer vents. So a cleaning-only company may not be registered. One that also repairs or replaces vents should be able to give you a number in the form PA followed by digits, which you can check in the state's contractor search.
3. Can I see proof of liability insurance? The Federal Trade Commission's advice is to ask a contractor for proof of insurance. HomeGuide puts the same question on its list.
4. Will I get the price in writing, and when do I pay? The FTC advises a written estimate that describes the work, the materials, the completion date and the price. It also says never to make the final payment until the work is done and you are satisfied. HomeGuide says not to pay in full upfront.

What should you ask if they find something wrong?

A cleaning visit often turns into a conversation about the vent itself. Three follow-up questions keep that conversation honest.

• Can you show me? Ask to see the crushed section, the disconnected joint or the nest before agreeing to anything. A photograph from inside the wall or the roof is reasonable to ask for.
• Which rule does it break? The residential code Pennsylvania has adopted is specific. It calls for a smooth metal duct, 4 inches in diameter, a specified maximum length of 35 feet less an allowance for each elbow, a backdraft damper at the outlet and no screen there. If you are told your vent is not to code, ask which of those points is meant.
• What would the repair cost, in writing? Angi and HomeAdvisor put rerouting or a new vent at $200 to $500. Work of that kind above $500 falls under the state's contract rules for home improvements.

Two offers deserve a second look when they come up. A bird guard or screen over the outlet conflicts with the code's rule against screens at the termination. A booster fan conflicts with its rule that domestic booster fans shall not be installed in dryer exhaust systems; the device the code does allow on a long run is a listed dryer exhaust duct power ventilator.

Which answers should make you hesitate?

• A price that cannot be given until the technician is in the house, with no range.
• No way of showing the result.
• A credential that cannot be checked with the body that issued it.
• Pressure to decide on the spot. The FTC lists pressure for an immediate decision among the signs of a home improvement scam.

What do you do with the answers?

Write them down next to each company's name and compare like with like. What happens during a dryer vent cleaning describes the visit, so you can tell whether what you were promised is what you got. The cost guide has the published ranges for every figure above, and businesses to call are on the dryer vent cleaning directory page.

Sources

1. How much does dryer vent cleaning cost?, HomeGuide
2. How Much Does Dryer Vent Cleaning Cost? [2026 Data], Angi
3. How Much Does Dryer Vent Cleaning Cost? [2025 Data], HomeAdvisor
4. How much does it cost to clean a dryer vent?, Fixr
5. Want to Make Sure Your Home is Safe for Your Loved Ones? Don't Neglect Your Dryer Vents!, National Air Duct Cleaners Association (NADCA)
6. Measuring Dryer Exhaust Duct Performance, National Air Duct Cleaners Association (NADCA)
7. Certification, Chimney Safety Institute of America (CSIA)
8. Frequently Asked Questions: Home Improvement Contractor Registration, Pennsylvania Office of Attorney General
9. Home Improvement Contractor Search, Pennsylvania Office of Attorney General
10. How To Avoid a Home Improvement Scam, Federal Trade Commission
11. 2021 International Residential Code, Chapter 15: Exhaust Systems, International Code Council
12. Clothes Dryer Safety, Association of Home Appliance Manufacturers (AHAM)