The last day to legally install a new R-410A split system is December 31, 2025!

Although R-410A will remain available in limited quantities for maintaining legacy systems, HVACR professionals must now become proficient with R-32 and R-454B and the equipment that relies on these refrigerants to operate effectively and efficiently. It is therefore crucial to start learning about these technologies and refrigerants if you have not already started to do so. 

To support this transition, ESCO Institute is committed to keeping you informed about the latest in refrigerant changes and the resources available to help keep you in lock step with the industry. 

Online Course

The ESCO Institute’s online course covers the latest standards, practices, procedures, and codes HVACR professionals need to safely work with mildly flammable refrigerants. This immersive learning tool allows users to interact with the content by reading, hearing, seeing, and validating their knowledge as they progress through the program.

Training Manual

If you prefer a traditional manual, ESCO Institute offers both English and Spanish options. The Low GWP refrigerant program manual covers:
  • Refrigerant safety
  • Introduction to Low GWP refrigerants
  • Refrigerant properties and characteristics
  • The refrigeration cycle
  • Working with refrigerant blends
  • Proper installation and service guidelines
  • Flammable refrigerant considerations
  • Associated codes & standards for A2L refrigerants

  • View a sample of the training manual.

    Registered ESCO Proctors can review a digital version of the manual by logging in and visiting the resource center.

    YouTube Resources

    Stay updated by following our YouTube channel, where our A2L Fact Check video series dives into essential topics about refrigerants, equipment, tools, and the refrigerant transition. We also feature a weekly live show discussing industry-relevant topics. View previously aired episodes here

    Don’t forget to subscribe to our channel to be amongst the first to know when new content is available!

    PowerPoint Presentations

    If you offer formal training classes, we have two PowerPoint presentations that align with the course/manual, available in English and Spanish.

    Free Practice Exams

    Get ready for the Low GWP (A2L) Refrigerants Safety Certification with free practice exams on our website.

    Get Certified

    To document that HVACR professionals have the retained knowledge to safely handle, transport, and store Low GWP Refrigerants, we offer a 50-question, closed-book certification exam.

    Additional Resources

    Check out the additional resources below that can help you, your students or technicians get ready for the A2L refrigerant transition!

    TP Chart Comparison:
    R-22, R-410A, R-454B and R-32

    Meet our brand-new Refrigerant TP Chart Comparison Guide - your go-to resource for understanding the nuances between R-22, R-410A, R-454B, and R-32, all in one place!

    This chart breaks down the key similarities and differences among these four primary refrigerants.

    Perfect for residential and light commercial HVAC education, our guide is designed to make complex information easy to digest, so you can stay ahead of the curve in this ever-evolving industry.

    Note: Image watermarked for web display. Actual chart is not watermarked.

    The link below will take you to the product page to buy a set of 25 PT charts - sold in larger quantity bundles too!

    Periodic Table Classroom 24" x 36" Poster

    Understanding the chemistry of refrigerants makes it easy to compare different refrigerants, understand blended refrigerants, recognize the olefin bond in an HFO, and many other chemistry related aspects of refrigerants.

    Download the poster free of charge right here on the HVACR Learning Network!

    Click the link below to purchase a poster (or 2 or 3...)