Refrigerants
R-32 vs R-454B: What's the Difference?
Two A2L refrigerants are replacing R-410A in new equipment. Here is how they differ — and what it changes on the job.
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What's Actually on the 2027 EPA 608 Exam
The first question-bank update in 30 years lands January 1, 2027. Here is what changes, what does not, and who has to care.
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A2L Refrigerant Safety Basics for HVAC Techs
One new variable — mild flammability. Here is the safety playbook for A2L systems, from ignition sources to cylinders.
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