Find NADCA-Certified Air Duct Cleaning Near You
Find NADCA-certified air duct cleaning companies in 65 US cities. Every company verified against the NADCA member directory.
What Is NADCA Certification?
The National Air Duct Cleaners Association (NADCA) requires member companies to have at least one ASCS-certified technician (Air Systems Cleaning Specialist) on staff who has passed a proctored exam covering HVAC system design, contamination assessment, and cleaning procedures.
Our directory cross-references every company against the NADCA member search tool. Companies not found in the NADCA database are marked as non-certified or flagged if they falsely claim membership.
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Why NADCA Certification Matters
The air duct cleaning industry is poorly regulated at the state level, which makes it a frequent target for scam operators. NADCA membership requires that a company employ at least one technician who has passed the ASCS (Air Systems Cleaning Specialist) exam, a proctored test covering HVAC system design, source removal cleaning methods, contamination assessment, and the NADCA standard ACR-2021.
NADCA members must also carry liability insurance and adhere to a code of ethics. The credential is verifiable through the NADCA member search at nadca.com. Any company that claims NADCA membership but does not appear in that search tool is misrepresenting its credentials — a finding our directory tracks and flags explicitly.
Common Air Duct Cleaning Scams
The EPA and NADCA have both documented a persistent pattern of fraudulent duct cleaning operations. The most common scheme: a company advertises whole-house duct cleaning for $49–$99, arrives, and then claims to find dangerous mold, excessive debris, or pest infestation that requires an expensive treatment costing hundreds or thousands of dollars. The photos shown may not be from your home, and the upsells are rarely necessary.
Red flags include: door-to-door solicitation or extremely low advertised prices; refusal to provide a written estimate before work begins; claims that your ducts contain toxic mold without a lab test; and pressure to approve chemical treatments or UV systems on the same visit. A legitimate NADCA-certified company will provide a written scope of work, itemized pricing, and a post-cleaning inspection report.
When Your Ducts Actually Need Cleaning
The EPA states that routine air duct cleaning is not necessary for most homes and has not been proven to prevent health problems. Duct cleaning is warranted in specific situations: visible mold growth inside ducts or on HVAC components (confirmed by testing, not just a technician's claim); ducts infested by rodents or insects; ducts clogged with excessive debris that is visibly restricting airflow; or following major renovation work that generated significant dust inside the system.
If you have no occupants with respiratory sensitivities and your system has been properly maintained with regular filter changes, cleaning every 3–5 years is a reasonable interval. More frequent cleaning is generally unnecessary and may indicate a sales pitch rather than a genuine need.
Our Verification Methodology
Every listing is verified against primary credentialing sources — not self-reported claims or paid placements. Read our full verification methodology for details on how we research and maintain each directory.