Welcome to North American Technician Excellence, Inc. The leading non-profit certification program for technicians in the heating, ventilation, air-conditioning and refrigeration (HVAC/R) industry and the only test supported by the entire industry.


2111 Wilson Blvd. Suite 510Arlington, VA 22201Phone: 703-276-7247Toll Free Phone: 877-420-6283 (NATE)

Testing Organizations

Elevate Your Industry

NATE certification offers limitless advantages to all professionals in the HVACR industry as well as our customers. Take an active part in improving the quality of professionalism and service we provide by becoming a NATE Testing Organization.

What It Takes to Be a TO

A NATE Testing Organization is an organization that agrees to follow the NATE testing protocols and offers at least four testing sessions a year. A NATE TO must have a minimum of one NATE-approved proctor.  A proctor can be any person who is a member of the Testing Organization, but he or she must be approved by NATE and cannot be an HVACR trainer.

Contractors are not eligible to become a NATE Testing Organization.