R-22, R-410A, R-454B — what the refrigerant transition actually means.

Why R-22 is a replacement decision, not a repair

R-22 (sold as Freon) was the residential AC refrigerant from the 1950s through 2009. The Montreal Protocol classified it as ozone-depleting and the EPA scheduled a manufacturing phase-out that landed its final date on January 1, 2020 — no new R-22 produced or imported in the US after that. Your existing R-22 system can still run forever. The problem is what happens when it leaks.

Every drop of R-22 charged into an AC system today came from a decommissioned system somewhere else — reclaimed, cleaned, recertified, resold. That reclaimed supply is finite and shrinking. The price per pound reflects it: from under $5/lb in 2010 to over $100/lb by 2026. A typical Florida 3-ton system carries a 6–8 pound charge. A complete refrigerant refill on a system that's fully evacuated is $600–$800 in refrigerant alone, before the labor to find the leak, repair it, pressure-test, evacuate, and recharge.

In Florida, where most R-22 systems are now 15+ years old, that's money invested in a system that's already past its design service life. The math stops making sense. A $1,500 R-22 repair on a 16-year-old system buys you maybe 2–3 years of runtime; the same $1,500 is a third of the way to a new Basic-tier install that comes with a 10-year warranty and R-454B.

R-410A: still fine, but the clock is ticking

R-410A (Puron) replaced R-22 starting around 2010. It was the residential AC baseline for about fifteen years — most systems installed in Florida between 2010 and 2024 are R-410A. It's not ozone-depleting, but its global-warming potential is high (2,088 vs R-22's 1,810), which is what triggered the next regulatory chapter.

The AIM Act — the US implementation of the Kigali Amendment — began the R-410A phase-down on January 1, 2025. From that date forward, new residential AC and heat pump equipment manufactured in the US must use a low-GWP refrigerant: R-454B for most mainline condensers, R-32 for some mini-splits. Existing R-410A equipment is completely unaffected. Your 2022 system will keep running on R-410A for the rest of its natural life — probably into the mid-to-late 2030s.

What will change: as R-410A production scales down, the per-pound price will climb the same trajectory R-22's did after 2010. Industry consensus is that R-410A hits $30–$50/lb by 2030 vs the current $8–$12/lb. That's not a crisis, but it's a slow-rolling cost pressure that'll start making 2015–2020 R-410A systems with leaks look a lot like today's R-22 systems: mathematically, replacement.

R-454B: what's actually different

R-454B is the new residential default. GWP 466 — about four-and-a-half times lower than R-410A. Operating pressures and cooling capacity are similar enough that equipment footprints and SEER2 ratings haven't changed much. Most mainline manufacturers (Carrier, Trane, Rheem, Goodman, American Standard) shipped their 2025 lineups using R-454B as the primary refrigerant with near- identical efficiency bands to their R-410A predecessors.

The one meaningful change: R-454B is classified A2L — mildly flammable. It's in the same safety class as natural gas and propane, and well below automotive refrigerants like R-1234yf. New equipment ships with A2L- rated safety interlocks on the air handler — a leak- detection sensor that shuts the blower off if a refrigerant concentration is detected. You'll never see this interlock on your thermostat or feel its presence during normal operation; it's a sealed component in the air handler cabinet.

For the technician, A2L means new handling procedures and updated recovery equipment. For the homeowner, install-day experience is identical to an R-410A system. Cooling performance is identical. Energy efficiency at the same SEER2 rating is identical. Annual operating cost is identical. If a contractor quotes you an “R-454B premium” over a similarly specced R-410A quote from a year ago, that premium is the installer's margin, not the technology's cost.

Why Florida's transition story is different

Three Florida-specific factors amplify the economics above. First, Florida systems run 4+ months of continuous cooling load, which means leaks manifest faster and compressors fail earlier than in climates with long shoulder seasons. The service interval is shorter, and that's the interval in which refrigerant price trajectories actually bite.

Second, coastal humidity and salt corrode outdoor coils at 3–5 years less than inland averages. When a coil leaks in Florida, it's usually at a coil bend or fin-tube joint, and it's usually a replace-the-coil decision rather than a seal. That's $1,800–$2,600 in labor before the refrigerant. Add $600–$800 in R-22 for the recharge and you're at $2,400–$3,400 for a repair on a 15-year-old system.

Third, Florida's HVAC labor pool is tight. Every technician in the state is EPA 608 certified (required for any refrigerant handling), and the added A2L-certified subset is still ramping. If your system develops a leak tomorrow, the refrigerant supply is a slower problem than scheduling a qualified technician in July. Planned replacements in January through April get you the best pricing and the shortest install windows.

The repair-or-replace decision, in one table

Before you call anyone.