Home › AC Refrigerant › What Refrigerant Does My AC Use?
There are two ways to answer this. One is certain and takes thirty seconds. The other is a probability, and this tool is honest about which one you are getting.
The certain way: read the nameplate
Nearly every outdoor condensing unit carries a data plate listing the refrigerant by name — R-22, HCFC-22, R-410A, R-32, or R-454B — usually next to a factory charge in pounds and ounces. Newer A2L equipment (R-32, R-454B) also carries a flammability marking that A1 equipment does not.
Full walkthrough of finding and reading the plate, including what to do when it is faded or facing a wall.
Watch for a retrofit sticker
If the nameplate says R-22 but a separate service sticker names R-407C, R-438A, MO99, R-422B, NU-22B, or R-417A, then the system was retrofitted and the sticker describes what is actually circulating. This matters: a technician who charges it as though it were R-22 will get the wrong result. What R-22 retrofits actually involve.
Why the year is only a probability
The era table is genuinely reliable at the extremes and genuinely uncertain in the middle. A 1994 system is R-22 with near-certainty. A 2015 system is R-410A with near-certainty. A 2007 system is a real coin-flip, because both refrigerants were in active production for new residential equipment that year.
| Equipment era | Most likely refrigerant | Confidence from year alone | Notes |
|---|---|---|---|
| Before ~1996 | R-22 | very high | R-22 was the dominant residential refrigerant for decades. A system this old is also well past typical service life, so refrigerant identification is usually a replacement-planning question rather than a repair question. |
| 1996-2004 | R-22 (also R-410A) | medium high | R-410A existed and was being adopted early by some manufacturers, but R-22 was still the default in this window. |
| 2005-2009 | R-410A (also R-22) | medium | The genuine transition period. Both refrigerants were in active production for new residential equipment, and the split varies by manufacturer and product line. This is the era where checking the nameplate matters most. |
| 2010-2021 | R-410A | very high | New residential air conditioners and heat pumps could no longer be manufactured pre-charged with R-22 from January 1, 2010, which makes R-410A the near-certain answer for equipment built in this window. |
| 2022-2024 | R-410A (also R-32) | high | Late R-410A era for central split systems. Ductless mini-splits are the exception: several manufacturers moved those to R-32 well before the 2025 rule, so a mini-split from these years is meaningfully more likely to be R-32 than a central system from the same year. |
| 2025 and newer | R-454B (also R-32, R-410A) | medium high | New equipment manufactured or imported from January 1, 2025 must use a refrigerant under GWP 700, so R-454B or R-32. R-410A stays on this list because equipment built before that cutoff may still be installed with no deadline under EPA’s May 2026 reconsideration rule, which means a system INSTALLED in 2025 or 2026 can legitimately still be R-410A. Installation year is not manufacture year. |
| Any age, after a retrofit | Could be another approved refrigerant | low | A system of any age may have been retrofitted to a different approved refrigerant, most often an R-22 system converted to R-407C, R-438A, R-422B, or R-417A. A retrofit should be recorded on a service sticker applied near the nameplate. When the nameplate and the service sticker disagree, the service sticker describes what is actually in the system. |
The year gives us a probability. The equipment label or manufacturer documentation gives us the answer. Never infer refrigerant from installation date alone when the nameplate is readable — and since EPA removed the R-410A installation deadline in May 2026, a system installed in 2025 or 2026 can still legitimately be R-410A.
One trap worth knowing about
Installation year is not manufacture year, and since May 2026 that gap matters more than it used to. EPA removed the installation deadline for R-410A equipment manufactured before January 1, 2025, so a contractor can still legitimately install pre-2025 R-410A stock today. A system installed in 2026 might be new R-454B equipment or might be R-410A that sat in a warehouse. Only the nameplate settles it.
Frequently asked questions
Can I tell my refrigerant from the model or serial number?
Sometimes. Serial-number formats vary by manufacturer, and some encode a manufacture date that narrows the era considerably. But the refrigerant itself is printed on the data plate, which is faster and more reliable than decoding a serial.
My nameplate is unreadable. What now?
Use the year and system type for a probability, then ask your technician to confirm and show you. Any technician working on the system has to know the refrigerant before touching it, so it is a reasonable thing to be shown.
Does a mini-split use different refrigerant than central AC?
Often, yes. Several ductless manufacturers moved to R-32 years before central split systems did, so a mini-split from roughly 2018 onward is meaningfully more likely to be R-32 than a central system of the same age.
Sources & verification
✓ Verified against a manufacturer, regulator, or standards source
- EPA, “Technology Transitions HFC Restrictions by Sector” — epa.gov
- EPA, “Homeowners and Consumers: Frequently Asked Questions” (HCFC phaseout) — epa.gov
Last reviewed 2026-08-31. How we verify what we publish →
