NADCA Air Systems Cleaning Specialist (ASCS) Certification Training Program

NADCA Air Systems Cleaning Specialist (ASCS) Certification Training Program

frequently asked questions

AIRAH) has signed a licensing agreement with the National Air Duct Cleaners Association (NADCA). As the exclusive training partner (licensee), AIRAH is able to deliver the Air Systems Cleaning Specialist (ASCS) Certification Training Program in Australia and New Zealand.

For more information on AIRAH’s offering of the NADCA ASCS Certification Training Program, please click here.

View answers to frequently asked questions about the NADCA ASCS Certification Training Program below.


What are the benefits of ASCS Certification?
ASCS Certification enhances professional development and is also a designated worldwide credential recognising a person’s knowledge and skills relating to HVAC system hygiene. ASCS Certification can benefit you professionally in many ways; including increased compensation, enhanced career mobility and marketability, and increased recognition to employers, customers and industry peers.

A growing number of job specifications require that a certified ASCS be on a project. Having an ASCS certified technician on staff can benefit your company in many ways, including meeting bid specifications, attracting more customers, and meeting the ASCS requirement for NADCA membership.

Is the individual or the business ASCS certified?
NADCA's Certification Training Program certifies individuals, not companies. Certified individuals may use the credential in marketing their own expertise. Certification is not transferable to other individuals.

Any certified individual who changes companies must contact NADCA, pay the administrative transfer fee, and complete the Certification Transfer Form.

Who should become NADCA certified?
NADCA recommends at a minimum that an owner, principal, or key employee of a company become a certified ASCS. There is no limit to the number of company representatives who can become certified.

How was the ASCS Certification examination developed?
As is customary with credentialing practices, NADCA worked with independent test development experts and industry professional Subject Matter Experts (SMEs) engaged in the practice of HVAC system cleaning to perform a job analysis for the ASCS certification. The job analysis ensures the credential reflects the most current practices in the industry and properly reflects the knowledge, skills, and abilities required for cleaning and restoring HVAC systems.

Once I become certified, how do I renew my Certification?
ASCS Certification is renewable each year before June 30 for a fee. Click here for more information on ASCS Renewal.

Once I become certified, who do I speak to about my Certification?
ASCS Certification is administered by NADCA and any questions regarding your Certification or renewal of Certification should be communicated with NADCA.

AIRAH is the training licence holder. We adhere to the NADCA training standards and policies as part of the licence agreement.

How can I prepare for the ASCS exam?
The ASCS examination tests knowledge and skills needed to become successful in the HVAC inspection, cleaning, and restoration industry. The exam covers a range of topics, including indoor air quality, safety, mechanical, field experience, and the ability to correctly apply practical knowledge.

Disclaimer: No one single publication, training course or reference guide will give you all the information you need to prepare for the ASCS exam. It is strongly recommended that prior to taking the exam, test takers review the recommended reading materials listed in the ASCS Candidate's Guide (provided to fully paid course participants at least 30 days in advance of the training course date), used as reference during the development of the ASCS Certification exam.

For more information on recommended preparations for the ASCS exam, please click here.


For additional information on AIRAH’s Australian and New Zealand offering of the NADCA Air Systems Cleaning Specialist (ASCS) Certification Training Program, please click here or email [email protected]