National Air Duct Cleaners Association
National Air Duct Cleaners Association (NADCA), is a global trade association representing the HVAC inspection, cleaning and restoration industry. It was formed in 1989 as a nonprofit association of companies engaged in the cleaning of HVAC systems. They offer several certifications for HVAC companies and professionals as well as maintain an anti-fraud task force. It is recommended by the United States Department of Labor to hire only duct cleaning professionals who are NADCA members.