Explore Certifications

EPA 608

To work in the HVAC/R industry, technicians who maintain, service, repair, or dispose of refrigerant-containing equipment must be certified under the Environmental Protection Agency’s Section 608 of the Clean Air Act.  Mainstream Engineering, an industry leader in education and training, is approved by the EPA to certify technicians for EPA Section 608 Type I, II, III, and Universal certifications. Learn More

EPA 609

Technicians planning to work with motor vehicle air conditioners (MVAC) and purchase refrigerants must obtain an EPA Section 609 certification. Mainstream Engineering offers an online 25-question, open-book test along with a free study manual to ensure your success. Learn More

HC(A3) & HFO(A2L) - Low GWP

As the HVAC/R industry evolves, more energy efficient and environmentally friendly refrigerants are introduced.  These Low GWP refrigerants  are considered flammable (A3) or slightly flammable (A2L).  Proper handling of these refrigerants is important, which is why Mainstream Engineering offers a complete A3/A2L Low GWP training for EPA 608-certified technicians. Learn More

Indoor Air Quality

Indoor air quality has become a top priority for technicians and homeowners alike. With Mainstream’s IAQ certification, technicians can add indoor air quality services to every service call. This training and test will cover the best ways for a technician to inspect, adjust, and maintain a building’s ducting, humidifiers, blowers, and more. These steps help to create cleaner, fresher air within the structure. Learn More


Although not required to work with refrigerants, our R-410A certification is beneficial because of the higher pressure associated with R-410A equipment. Mainstream Engineering created a training program designed for EPA Section 608 technicians to handle R-410A safely. Learn More

Green HVAC/R

Those looking for a new way to gain the edge in providing eco-friendly and professional HVAC services can rely on Mainstream’s Green Certification program. This certification shows that you are up-to-date on energy audits, energy-efficient equipment, and preventative maintenance measures to ensure optimum HVAC operation. Many home and business owners are concerned about their environmental impact, making our Green HVAC/R program a great choice for responsible and efficient services. Learn More

PM Tech

A preventative maintenance technician can provide a full range of services to keep cooling systems in optimal condition. Our PM Tech Certification provides training and instruction on acid and moisture detection, water and acid removal, compressor maintenance, refrigeration charging techniques, coil maintenance, leak testing, and more. This Mainstream Engineering certification program is effective for technicians looking to gain an edge in a competitive industry. Although not required, this program is geared toward EPA 608 technicians who want to sharpen their skills. Learn More

Have Questions?

If you are looking for EPA certifications for work in the HVAC industry, you can rely on Mainstream Engineering for fast, professional testing measures and training you can trust. Check out our online store for certification cards and wall certificates, and contact us if you have any questions.