Is the unit tripping only when running? Learn to spot "rub-outs," vibration shorts, and intermittent wiring issues that standard meters miss.

Is your HVAC unit a "bird's nest" of wires? We expose the dangers of bad electrical work, from vibration rub-outs to fire hazards, and how to fix sloppy wiring for good

Discover the top 10 signs of faulty electrical wiring in your HVAC unit. From tripping breakers to burning smells, learn how to spot bad wiring and prevent costly HVAC issues today.

Whether you are managing "sell-through" inventory or commissioning a brand-new A2L system, you need data, not history lessons. We have compiled the ultimate A2L refrigerant list, a quick-reference A2L refrigerant pressure chart, and the specific 2026 compliance rules for your van.

Bookmark this page. You are going to need it.

Unlike previous transitions that focused solely on saving the ozone layer, the shift we experienced in 2025 was about lowering the "Global Warming Potential" (GWP) of the gas inside your AC. New A2L refrigerant options, such as R-454B (now common in homes) and R-454A (now standard in commercial refrigeration), are chemically designed to absorb significantly less heat in the atmosphere if they leak.

So, are A2L refrigerants flammable? Yes, by strict definition. Is your new AC dangerous? No.

The A2L refrigerant flammable label is there for technicians handling tanks in the back of a hot van, not for homeowners enjoying cool air. With high ignition temperatures, slow burning speeds, and advanced safety sensors, these new HFO-based systems are designed to be as safe as—if not safer than—the older units they replaced.