NHG employees are some of the most well-trained and certified individuals in the industry. Having our staff certified with the following certifications separates us from the rest. Our staff are annually certified in all HVAC certifications. Our consultants possess the skills and knowledge required for the successful consultation of commercial and residential HVAC claims.

HVAC Excellence

Programmatic Accreditation, Educator Credentialing, Student Outcome Assessments, Stackable, and Portable Credentials (Industry and Government Certifications), Curriculum, Standard Development, Publishing Services, Data Registry Services, Custom Software Development, and Professional Development through our National HVAC Educators and Trainers Conference. Additionally, ESCO Institute is the largest provider of the EPA Section 608 Certification.

North American Technician Excellence (NATE)

Founded in 1997, North American Technician Excellence (NATE) is the nation’s largest non-profit certification organization for heating, ventilation, air conditioning and refrigeration technicians. Headquartered in Arlington, VA, NATE is the certification organization that was developed by, and has been supported by the entire HVAC industry for nearly 20 years.

Environmental Protection Agency (EPA)

The United States Environmental Protection Agency (EPA) has required that all persons handling refrigerants should be certified. If you are not certified you can’t legally buy refrigerants.

Green Mechanical Council

The Green Mechanical Council is an association of more than 300,000 individuals. Representing those who manufacture, design, build, install, maintain, and service the energy efficient and environmentally responsible mechanical systems built or retrofitted into today’s commercial and residential structures.

Underwriter Laboratories

As a global company with more than 120 years of expertise, UL works with customers and stakeholders to help them navigate market complexity. UL brings clarity and empowers trust to support the responsible design, production, marketing and purchase of the goods, solutions, and innovations of today and tomorrow. We connect people to safer, more secure, more sustainable products, services, experiences and environments – enabling smarter choices and better lives.

Refrigeration Service Engineers Society

RSES is the leading education, training and certification preparation organization for HVAC professionals. RSES publishes various comprehensive industry training and reference materials in addition to delivering superior educational programs designed to benefit HVAC professionals at every stage of their careers.


National Air Duct Cleaners Association

NADCA is dedicated to providing information and helpful resources to educate consumers about the proper methods of HVAC inspection, cleaning and restoration for residential projects.