Klein Trade Program – Week 25

October 10, 2026

Another Saturday, another week of our free HVAC trade training program here at Klein Cooling.

We’re getting closer to our EPA 608 certification exam, so this week we continued working through Core and moved into Type I.

But before we opened the study guides, we spent some time talking about something else happening in the HVAC industry.

And it has nothing to do with refrigerant.

Who Actually Owns Your HVAC Company?

Before class, we had a discussion about private equity and the growing number of HVAC companies being purchased by large investment groups.

It’s something we’ve talked about quite a bit at Klein Cooling, and something we think anyone entering the trade should understand.

A company can have a local name, local trucks, and a familiar face on its advertising without necessarily being locally owned anymore.

And while there’s nothing inherently wrong with a company being purchased, ownership can influence how a business operates.

We talked about the difference between working for a company focused primarily on selling equipment and one focused on diagnosing, repairing, and taking care of customers.

Not every large company operates the same way, and not every small company gets it right either.

But it’s worth understanding who you’re working for, what they expect from their technicians, and how those expectations might influence the recommendations made to homeowners.

A good technician should know how to diagnose a system before learning how to sell someone a new one.

That’s something we want our students to carry with them, regardless of where their careers take them.

Back to EPA 608: Core

After our discussion, we got back into EPA Section 608.

Last week, we began reviewing Core, which covers the foundational knowledge every technician needs for EPA certification.

This week, we continued working through that material, including refrigerant regulations, environmental concerns, safe handling practices, and the differences between refrigerant families.

There’s a lot to remember.

CFCs, HCFCs, HFCs, HFOs, ozone depletion potential, global warming potential, recovery, recycling, reclamation, and a collection of rules and definitions that can start to sound pretty similar after a while.

And that’s before you get into all the refrigerant numbers.

Which led us to another question:

What if we could recognize some of the answers instead of memorizing every single one?

Recognizing the Patterns

One of the things we’ve been working on is finding the patterns behind refrigerant classifications and numbering systems.

For example, the 400-series is commonly associated with zeotropic refrigerant blends, while the 500-series identifies azeotropic blends.

Certain single-component refrigerant numbers can even tell you how many carbon, hydrogen, and fluorine atoms are present.

And once you understand the differences between CFCs, HCFCs, HFCs, and HFOs, questions about ozone depletion and global warming potential become a little easier to sort out.

Of course, not everything follows a simple rule. Some information still needs to be memorized, and there are exceptions to many of the patterns.

But understanding why something is classified a certain way is a whole lot more useful than staring at a list of refrigerants and hoping the right answer sticks.

So we created another free study resource.

Free EPA 608 Refrigerant Patterns & Blends Study Guide

This new companion guide covers refrigerant families, numbering systems, ODP and GWP, zeotropic and azeotropic blends, temperature glide, bubble and dew points, refrigerant safety classifications, and useful exam memory rules.

It also separates dependable rules from general patterns and facts that simply need to be memorized.

We put it together for our students, but we’re making it available to anyone else preparing for EPA 608.

Download the Free EPA 608 Refrigerant Patterns & Blends Guide

No email address. No registration. Just a free resource for anyone who can use it.

Moving Into EPA 608 Type I

We also began covering Type I certification.

Type I deals with small appliances, which the EPA generally defines as appliances manufactured, charged, and hermetically sealed at the factory that contain five pounds or less of refrigerant.

This includes equipment such as household refrigerators, freezers, window air conditioners, and certain other small appliances.

We introduced the requirements and procedures specific to recovering refrigerant from these systems, along with the differences between Type I and the other certification categories.

It’s an important reminder that refrigerant handling isn’t one-size-fits-all.

Different equipment can have different recovery requirements, and technicians need to understand which rules apply before beginning work.

Getting Closer to Exam Day

Our students have spent months learning the fundamentals of HVAC, from electrical circuits and airflow to refrigeration, installation practices, and troubleshooting.

Now we’re working toward the certifications that will help them take the next step.

EPA 608 is coming up in the next few weeks, followed by continued preparation for NATE Support Technician.

And while passing those exams is important, our goal remains the same.

We’re not trying to teach people how to pass a test and then figure everything else out later.

We’re trying to build a foundation of knowledge, practical skills, good judgment, and integrity that they can carry into the trade.

Week 25 complete.

Comfort. Integrity. Legacy.

Klein Cooling LLC — Free HVAC Trade Training Program, Bunnell, Florida