How to choose a dryer vent cleaning company in Pennsylvania

Updated November 10, 2026 · KeystoneProGuide editorial team

How do you choose a dryer vent cleaning company?

By checking five things yourself, because the state does not do it for you. The Pennsylvania Department of Labor and Industry says the Commonwealth has no licensure or certification requirements for most construction contractors, and nothing in the state sources read for these guides sets up a license for cleaning dryer vents. What you can check is a credential, a registration where one applies, insurance, complaints, and a written price that says what the visit includes.

Which kinds of business clean dryer vents?

Several, and that is why comparing them takes some care. The Attorney General's contractor search sorts registered businesses by type of work, and its list has no entry for dryer vent cleaning. The nearest entries are Chimney Sweep, Cleaning & Janitorial Services, HVAC and Handyman Services. HomeAdvisor's cost guide likewise expects the job to be sold alongside air duct or chimney cleaning.

So two quotes may come from two different trades. Compare them on what they will do and how they will show the result, not on the name of the trade.

Which credentials exist, and what do they prove?

Two industry bodies have something specific to dryer vents. Neither is required by any Pennsylvania source read for these guides, and both describe themselves in their own terms.

Certified Dryer Exhaust Technician (CDET). The Chimney Safety Institute of America says this credential is recognized in all 50 states and is the only certification specifically for people who service dryer vents. Candidates take a three-day course, a one-day review or an online review, then an exam of 50 multiple choice questions in 30 minutes. The institute says certificate holders must agree to a code of ethics, that a certification may be revoked for a violation, and that the credential has to be renewed. It is an individual's credential, so ask which technician holds it and whether that person is coming to your house. The institute's website has a search for certified professionals by ZIP code.
NADCA membership and its dryer standard. The National Air Duct Cleaners Association, a trade association of companies that clean heating and cooling systems, publishes a Dryer Exhaust Duct Performance Standard. It tells homeowners to ask whether a technician follows that standard, and it keeps a member directory searched by ZIP code.

One caution comes from the certifying side itself. Writing about chimney sweeping, the Chimney Safety Institute says that in a mostly unregulated industry anyone can draft an exam and hand out a certificate, and that not all certifications are equal. Treat a logo as a claim to verify with the body that issued it.

Does the company have to be registered with the state?

Sometimes, and the official guidance leaves a gap. Pennsylvania requires home improvement contractors to register with the Office of Attorney General. The Attorney General's questions and answers define a home improvement as repair, replacement, installation, alteration and similar work at a private residence where the total price is more than $500. Cleaning is not on the list, and the page never mentions dryer vents.

In practice that means two things.

A company that only cleans may or may not be registered, and the state's guidance does not settle whether it must be.
A company that offers to repair, reroute or replace your vent is offering work the definition names. Ask for its registration number before that work is priced.

Registration is easy to check and worth understanding. Registered contractors must print their number, PA followed by digits, on advertisements, estimates and contracts. The search tool shows active registrations only. Applicants must show insurance of at least $50,000 for personal injury and $50,000 for property damage. The Attorney General also says registration is not an endorsement, recommendation or approval of a contractor's competency or skill. What Pennsylvania requires goes through the law and the building code in detail.

What should you check before you book?

Insurance. The Federal Trade Commission's advice on hiring contractors is to ask for proof of insurance. Do this whether or not the company is registered.
Complaints. The Attorney General advises checking references and looking for complaints filed with the Better Business Bureau. The FTC adds a simple test: search the company's name online with words such as scam, review or complaint, and read reviews with a critical eye.
More than one price. HomeAdvisor advises quotes from three local companies, and HomeGuide says three or more. The FTC says not to choose the lowest bidder automatically, and to ask for an explanation when estimates differ widely.
What the price covers. HomeGuide suggests asking whether the visit includes the lint trap, the outside vent flap and the inside of the dryer cabinet, and what extra costs can apply.
How the result will be shown. HomeGuide suggests asking whether airflow at the outside opening will be measured before and after. NADCA describes a performance test with a pressurized blower and says a video inspection does not replace it. A company that can describe its check in plain words is easier to hold to it.
Payment terms. HomeGuide says not to pay in full upfront, and the FTC says never to make the final payment until the work is done and you are satisfied.

What is worth asking about the vent itself?

A company that knows the building code will raise these points without being asked. You can raise them anyway.

What the duct behind the dryer is made of, and whether it should be replaced.
Roughly how long the run is and how many turns it makes.
Where it ends, and whether the outside hood has a working flap and no screen.

The answers shape the price, and they tell you whether the person on the phone has looked at many dryer vents.

What is different in Philadelphia?

The city licenses contractors itself, with an exception: a business that works only on existing one- or two-family homes registers with the state as a home improvement contractor instead. The city's lookup tool lists every actively licensed contractor and any licensing violations, so in Philadelphia there are two places to look a company up.

Where do you start?

With the vent, then the price. The cost guide shows what the published surveys say a visit should cost and which extras to price in advance. Businesses that clean dryer vents are listed on the dryer vent cleaning directory page.

Sources

Contractor Licensing, Pennsylvania Department of Labor and Industry
Home Improvement Contractor Search, Pennsylvania Office of Attorney General
Frequently Asked Questions: Home Improvement Contractor Registration, Pennsylvania Office of Attorney General
Home Improvement Contractor Registration, Pennsylvania Office of Attorney General
Home Improvement Contractor Verification, Pennsylvania Office of Attorney General
Certification, Chimney Safety Institute of America (CSIA)
Becoming a Certified Dryer Exhaust Technician, Chimney Safety Institute of America (CSIA)
CDET 1-Day Review and Exam, Chimney Safety Institute of America (CSIA)
Why hire a CSIA Professional?, Chimney Safety Institute of America (CSIA)
Want to Make Sure Your Home is Safe for Your Loved Ones? Don't Neglect Your Dryer Vents!, National Air Duct Cleaners Association (NADCA)
Measuring Dryer Exhaust Duct Performance, National Air Duct Cleaners Association (NADCA)
How Much Does Dryer Vent Cleaning Cost? [2025 Data], HomeAdvisor
How much does dryer vent cleaning cost?, HomeGuide
How To Avoid a Home Improvement Scam, Federal Trade Commission
Find a licensed contractor and contractor information, City of Philadelphia