Codes & Certification

EPA 608, the AIM Act, A2L refrigerant rules.

By symptom:AC Not CoolingRefrigerant Leak
By part:CompressorMetering Device (TXV, Piston, EEV)

EPA 608

1 guide →

Certification types, the 2026 exam and study plans.

EPA 608 Certification in 2026: Types, the New Exam and What Changed

EPA Section 608 certification types, how the exam works, the new question bank introduced in 2026, and whether existing cards are still valid.

Refrigerant Rules

4 guides →

HFC phasedown, A2L requirements and what changed.

HFC Rules in 2026: What the AIM Act Means for HVAC Techs

The 2026 state of the HFC phasedown, the R-410A installation rule change, and the new 15-pound leak-repair rules, explained for service techs.

Servicing R-22 Systems in 2026: Recharging, Retrofits and Repair-or-Replace

What you can and can't do with an R-22 air conditioner or heat pump today, where R-22 comes from now, how retrofit refrigerants work, and how to help a customer decide between repair and replacement.

R-32 vs. R-454B: The Differences That Matter on a Service Call

Side-by-side comparison of R-32 and R-454B for techs, covering composition, GWP, pressures, glide, discharge temperature, charging and safety.

R-454B for Technicians: Pressures, Charging, Tools and Safety

What changes when you service R-454B, the A2L that replaced R-410A in many new systems, from glide and liquid charging to A2L tools and leak sensors.