NADCA is the National Air Duct Cleaners Association, the trade body for companies that clean HVAC systems. It publishes ACR, the NADCA Standard, for the Assessment, Cleaning and Restoration of HVAC systems. To be a member, a company must keep at least one certified Air Systems Cleaning Specialist (ASCS) on staff, carry general liability insurance, clean to the ACR Standard and follow NADCA’s Code of Ethics.
What Is NADCA Certification?
People often say “NADCA certified” to describe a duct cleaning company. Strictly speaking, there are two parts to it. The company becomes a NADCA member, and the technicians earn NADCA’s Air Systems Cleaning Specialist (ASCS) certification. A member company needs at least one ASCS on staff, and that person keeps the certification active through continuing education.
The rulebook behind it all is ACR, the NADCA Standard. ACR sets out how to assess an HVAC system, how to clean it, and how to check that it is actually clean afterwards. NADCA describes it as a benchmark for best practices, and it is specified for commercial projects as well as by homeowners.
| Full name | National Air Duct Cleaners Association (NADCA) |
|---|---|
| What it is | A trade association for companies that clean HVAC systems |
| Main standard | ACR, the NADCA Standard (Assessment, Cleaning & Restoration of HVAC Systems) |
| Technician credential | Air Systems Cleaning Specialist (ASCS), renewed with continuing education |
| Member company must | Have at least one ASCS on staff, hold general liability insurance, clean to the ACR Standard and follow the Code of Ethics |
| Who it helps | Homeowners, condo and building managers, facility teams and anyone hiring a duct cleaner |
Why NADCA Membership Matters When You Hire a Duct Cleaner
Duct cleaning quotes can look very similar on paper. One company may clean the full supply and return system, while another only vacuums the vent covers. A NADCA membership gives you something concrete to compare: a written standard the company has agreed to follow.
A written standard
ACR spells out assessment, cleaning and verification steps, so “cleaned” has a clear meaning.
A trained specialist
At least one ASCS-certified technician works for every member company.
Insurance in place
Members must carry general liability insurance while working in your home or building.
What NADCA Membership Means for Your Job With Us
For Universal Duct Cleaning, the membership supports the way our crews already work across Toronto and the GTA. Here is what you can expect on a typical visit:
Our technician looks at your system before any cleaning starts and recommends only the service it actually needs.
We clean supply and return ductwork with truck-mounted and portable equipment, sized to the home or building.
We take before and after photos where applicable, so you can see the difference for yourself.
You get a clear quote and an honest recommendation. No surprise fees and no pressure.
Who Benefits Most
Homeowners often book duct cleaning after a renovation, before moving in, or when dust and odours keep coming back. Pet owners and families with allergy concerns also tend to ask about it.
Commercial clients such as offices, restaurants, schools, clinics, warehouses and multi-unit buildings often have tender documents that name the ACR Standard. Working with a NADCA member makes that requirement simpler to meet. See our commercial and industrial duct cleaning page for more.
How to Verify a NADCA Member
You do not have to take any company’s word for it, including ours. NADCA itself suggests asking for proof of membership and certification. Here is a simple way to check:
Ask for proof
Ask the company to show its current NADCA membership and the name of its ASCS-certified technician.
Search NADCA’s directory
Look the company up in the member directory on nadca.com.
Check the quote
Make sure the written quote says the work follows ACR, the NADCA Standard.
Ask about results
Ask how the company shows the system is clean afterwards, such as before and after photos.
Frequently Asked Questions
Is NADCA certification required to clean ducts in Ontario?
What does ASCS stand for?
What is the ACR Standard?
How can I check if a duct cleaner is a NADCA member?
Does Universal Duct Cleaning clean commercial systems to the NADCA standard?
Information about NADCA is summarized from the organization’s own public materials. Last reviewed November 2026.
