The HVACR Training Authority™

Digital Edition

Check out the latest issue of RSES Journal for features including: Under the UV Influence, Retrofit for Sustainable Supermarket Refrigeration, Proper Ventilation in 2020 and more. All inside your July 2020 RSES Journal issue.



Calendar of Events

Featured Product

NATE Commercial Refrigeration Powerpoint Instructor CD

NATE Commercial Refrigeration Powerpoint Instructor CD


COVID-19 Update

Beginning June 1, 2020, per the five-phase plan to re-open Illinois issued by Governor Pritzker, RSES Headquarters staff has returned to the office during regular business hours of 8:30 am – 5:00 pm (CST), Monday through Friday. 

We will be taking every precaution to ensure our safety, but we’ll be onsite to answer your phone calls and emails more promptly! You call us at 847/297-6464 or email us at
Thank you for your understanding and patience during this unusual time. We so much look forward to getting back into the office to better serve you!

Please know, we will maintain the free resources page created during this time to continue to support remote education. Visit often, as the page will be frequently updated: RSES COVID-19 RESOURCE PAGE.

Society & Industry News

What Wet Bulb Temperature Tells Us -- Part 1

It is commonly stated that wet bulb temperature indicates the moisture content of the air. Moisture content of air is called humidity ratio or specific humidity and is measured in pounds of water in a pound of dry air.

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Under the UV Influence

UV disinfection continues to emerge as a popular virus pandemic defense; learn how it’s being utilized and installation and marketing guidelines.

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Retrofit for Sustainable Supermarket Refrigeration

Perhaps more than any time in history, supermarket operators are re-evaluating their legacy refrigeration systems. Retail market drivers—including regulatory mandates, sustainability objectives and the emergence of e-commerce fulfillment models—are dictating changes to refrigeration architectures.

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Proper Ventilation in 2020

The world is in the middle of a catastrophe like one has never seen before. As scared as I am for my loved ones, I am proud to be of a profession capable of making a difference. This is a ?eld in which we need to further enhance our commitment to ensuring the safety of our clients. Each and every environmental system sold, installed, serviced or maintained should be handled with the utmost care and professionalism.

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(More Than) One Hundred Years of Ammonia Refrigeration

Step back in time to learn about the history of ammonia from the RSES “620-88 Section 1E” Service Application Manual (SAM) Chapter re-published here from the SAM archive.

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RSES is the leading education, training and certification preparation organization for HVACR professionals. RSES publishes various comprehensive industry training and reference materials in addition to delivering superior educational programs designed to benefit HVACR professionals at every stage of their careers through instructor-led training courses, online training for HVAC, educational seminars, interactive CD and DVD products, industry-related reference manuals, and helpful technical content through Service Application Manual chapters, the RSES Journal, the RSES Journal archives and feature articles, as well as web-exclusive features.

Beginning with basic theory and extending to complex troubleshooting, training courses covering refrigeration and air conditioning, heating, electricity, controls, heat pumps and safety may be conducted in a classroom environment or though self study. RSES publications may be purchased by schools, contractors, manufacturers or any other industry group wanting to conduct comprehensive training programs. Seminars covering air conditioning troubleshooting, electrical troubleshooting, compressor training, condenser training, refrigerant piping practices, DDC controls, and more are held in various cities across North America.

Select training programs offer Continuing Education Units (CEUs) and NATE Continuing Education Hours (CEHs).

In addition, RSES offers industry certification preparation materials for refrigerant handling (EPA Section 608), R-410A and North American Technician Excellence (NATE) examinations.

RSES’ monthly magazine, RSES Journal, serves HVAC contractors, service technicians, students, operations/maintenance managers, engineers and technicians who work in the residential, light commercial, commercial and institutional markets on air conditioning, warm-air heating, refrigeration, ventilation, electrical, ice machines, chillers, hydronic heating, piping, refrigeration control and energy management, building automation, indoor air quality and duct cleaning, and sheet metal fabrication equipment and/or systems.
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