How your system works4 min readAugust 25, 2026
R-454B and the A2L transition: what it means if your system uses R-410A
Since 2025, new residential systems use low-GWP A2L refrigerants like R-454B or R-32 instead of R-410A. Existing R-410A systems can be repaired and serviced for their full life. New A2L systems cost slightly more, include built-in leak detection, and require technicians with A2L-rated tools and training.
What did not change
Nothing requires you to replace a working R-410A system. Refrigerant for service remains available, and manufacturers still make repair parts. If someone tells you the refrigerant rule means you must replace now, get a second opinion. The same was said about R-22 for years, and plenty of R-22 systems were repaired well past the deadline.
What did change
New equipment uses R-454B (most brands) or R-32 (Daikin, Goodman, Amana). Both are classified A2L, mildly flammable with a low burning velocity, and new systems ship with refrigerant sensors that shut the compressor down and run the blower if a leak is detected. Service requires A2L-rated recovery machines, vacuum pumps and leak detectors, and refrigerant for the new systems has been in tighter supply and higher priced during the changeover.
What to ask your installer
Ask whether the technicians are trained on A2L handling and carry rated tools, whether the line set will be replaced or verified for the new refrigerant, which refrigerant the quoted system uses, and whether the quote includes the sensor and the control wiring it needs. A good proposal names the refrigerant on the first page.
Questions on this
Is R-454B dangerous in my house?
A2L refrigerants are classified mildly flammable and are hard to ignite; the sensors and the design rules exist to keep any leak well below the concentration that matters. Millions of systems have been installed with them.
Will R-410A get expensive like R-22 did?
Production is being phased down, so prices will rise over years, not overnight. A system that is leaking should be fixed either way; a system that holds its charge uses no refrigerant at all.