About this course

This is the prep course for ESCO's "Low GWP Refrigerant Safety - A2L Refrigerants" examination. Brynn Cooksey is one of the best HVAC instructors in the world, and you really get to work with him in this course. He will answer all of your questions on the discussion board and help you pass the exam.

Why Low GWP Refrigerants?

To address the concerns of ozone depletion and global warming, many of the refrigerants that were used for decades are being phased out by the federal government. These older refrigerants are being replaced with more efficient and environmentally friendly refrigerants. Many of these refrigerants are classified by ASHRAE (American Society of Heating Refrigeration and Air Conditioning Engineers) as flammable. The refrigerants will require special safety training to handle them. This course will discuss refrigerant safety, refrigeration characteristics, proper installation and servicing guidelines, and more. 

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Course outline

3 modules • 20 assignments • 1:17 hours of video lectures

Module 1 • 11 assignments
Low GWP Refrigerant Safety: Flammable and Mildly Flammable (A2L) Refrigerants

The world of Air Conditioning and Refrigeration is changing as we know it. The EPA (Federal Government) is phasing out older refrigerants that are harmful to the environment. The newer, more efficient refrigerants come with a caveat: they can be flammable, and some may operate at a higher pressure than traditional refrigerants. To work safely with the newer refrigerant, technicians must be retrained and certified to handle A2L refrigerants. The course discusses the basic refrigeration mechanical vapor compression cycle, refrigerant blends, field procedures, and how to handle flammable refrigerants. Please note that this is not intended to replace formal training. Individuals taking this course should have some familiarity with Mechanical Vapor Compression systems. It is recommended that you complete the EPA Section 608 Certification Refrigerant Handling Course as a prerequisite to this course. After you complete this course, you should be prepared to take the Low GWP Refrigerant Safety Certification Exam. This certification is a closed-book proctored exam. You must achieve a minimum score of 70% to obtain the certification.

  • Details about taking the Low GWP Refrigerant Safety Certification Exam
  • Low GWP Refrigerant Safety: Flammable and Mildly Flammable (A2L) Refrigerants - Section 1 - Core
  • Refrigerant and Safety Awareness (06:32 minutes)
  • Refrigeration Cycle Fundamentals (14:32 minutes)
  • Modern Refrigerant Types (06:00 minutes)
  • Refrigerant Designation Types (03:26 minutes)
  • Charging and Recovery (05:59 minutes)
  • Evacuation, Brazing and Leak Testing (09:20 minutes)
  • The R410A Transition to A2L Refrigerants with HVACR Expert Don Gillis
  • Big Refrigerant Changes to A2L w/ Jason at ESCO
  • R-410A Alternative Refrigerants Explained!
Module 2 • 3 assignments
Low GWP Refrigerant Safety: Flammable and Mildly Flammable (A2L) Refrigerants - Section 2 - A2Ls

This section expands our discussion and focuses on working with A2L refrigerants. The topics we will cover in the section include refrigerant safety classifications, combustion and thermal decomposition of refrigerants, field procedures, and the ASHRAE standards and codes that govern A2Ls and their use.

  • Safety-Labelling and Flammability (12:40 minutes)
  • System Installation, Requirements and Repairs (10:44 minutes)
  • Summary of Standards and Code and Common Refrigerants (07:48 minutes)
Module 3 • 1 assignments
Low GWP Refrigerant Safety - Quiz

Take the practice exams. You need 70% to pass. This practice test will prepare you for the Low GWP Refrigerant Safety Certification exam.

  • Low GWP Refrigerant Safety - Quiz


  • Brynn Cooksey

    ESCO's Top 25 Most Influential HVACR Instructors of 2024, HVAC U
    View profile

    Brynn Cooksey, CEM, CMS, RCT, was named one of ESCO's Top 25 Most Influential HVACR Instructors of 2024. He has been in the Building Science industry for over 20 years. Brynn specializes in residential and commercial building performance. A genuine product of his environment, he started his career as an employee of his family’s heating, cooling, and refrigeration... Learn more

Frequently asked questions

How does this course work?
This 3 module course is delivered entirely online. This course is self-paced and you can set your own schedule to complete the materials. During your year of access the instructor will be in the course answering questions on the discussion board. After successfully completing the course, you will be able to generate a certificate of completion.
How long do I have access to the materials?
Students can pre-order but will not be able to access the full course materials or earn a certificate of completion until the course is fully published. Once the course is published any students who have pre-ordered will then have access to the course materials for one year (365 days). After the one year of access expires, access can be extended by joining as a HeatSpring member. A single membership extends access to course materials for all past enrollments.
Is there a certificate of completion?
Yes, when you complete this course you are eligible for a certificate of completion from HeatSpring. You can download your certificate as soon as you have completed all of the course requirements. Students can easily share their verified certificates on their LinkedIn profiles using our LinkedIn integration.
Can I register multiple people?
Yes please visit our HeatSpring for Teams page to get a group discount.

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