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About Us
At EPATest.com, we believe knowledge is the foundation of success. From the EPA Section 608 exam to essential tips and insights.
As a trusted certifying agency, Mainstream Engineering provides a wide range of certifications, including Section 608 (Types I, II, III, and Universal), EPA Section 609, and other industry-specific qualifications that ensure comprehensive, industry-standard training and certification.
Through our comprehensive educational resources and certification programs, we empower professionals to advance their careers with confidence and expertise.
Get EPA 608 Certified
Mainstream Engineering has been a trusted leader in EPA Section 608 Certification for decades.
Since 1994, we've helped technicians get certified with comprehensive study guides, practice exams, textbooks, and a certification test designed to assess but also to educate on safe refrigerant handling.
More Certifications
EPA SECTION 609
HC(A3) + HFO(A2L)
Indoor Air Quality
R-410A
Green HVAC/R
PM Tech
Study material & practice exams
Online & In-person Exams
In-house Customer Support
Show off your certifications
Display your hard-earned credentials with custom decals, patches, and more. Proudly showcase your success!