ASCS (Air Systems Cleaning Specialist)

NADCA's individual technician certification — the person-level credential behind a NADCA member company.

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Numbers that matter

What it certifies
An individual technician
Issued by
NADCA
Company equivalent
NADCA membership

ASCS — Air Systems Cleaning Specialist — is NADCA's certification for an individual technician. Where NADCA membership applies to a company, the ASCS applies to a person who has passed NADCA's exam on proper inspection and cleaning of HVAC systems.

It matters because a company credential only helps if a qualified person actually shows up. A firm that employs ASCS-certified technicians is more likely to clean to the ACR Standard on your specific job, not just carry a membership logo on its website.

Related NADCA credentials you may see include CVI (Certified Ventilation Inspector) and VSMR (Ventilation System Mold Remediator) for mold scope. Ask whether the technician assigned to your job — not just the company — holds one of these.

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Generated: 2026-06-05 · Last reviewed: 2026-06-05