North American Technician Excellence (NATE)
NATE was founded in 1997 as the nation’s largest non-profit certification organization for heating, ventilation, air conditioning and refrigeration technicians. NATE-approved testing organizations throughout the U.S. and Canada offer NATE tests. Candidates can earn installation and/or service certification in nine specialty areas: air-conditioning, air distribution, heat pumps, gas heating, oil heating, hydronic gas, hydronic oil, and commercial and light commercial refrigeration.