# R-125/R-290/R-134a/R-600a (55.0/1.0/42.5/1.5) — HVAC refrigerant replacements: retrofit compatibility, safety class, GWP and lubricant

For R-125/R-290/R-134a/R-600a (55.0/1.0/42.5/1.5), trade name(s) is ICOR AT-22; retrofit / new is R/N; ashrae safety class is A1; gwp is 2,530; listing status / notes is Acceptable, verified against its source on 2026-08-11.

- **Refrigerant:** R-125/R-290/R-134a/R-600a (55.0/1.0/42.5/1.5) _(verified: appears in the quote below)_
- **Trade name(s):** ICOR AT-22 _(verified: appears in the quote below)_
- **Retrofit / new:** R/N _(verified: appears in the quote below)_
- **ASHRAE safety class:** A1 _(verified: appears in the quote below)_
- **GWP:** 2,530 _(verified: appears in the quote below)_
- **Listing status / notes:** Acceptable _(verified: appears in the quote below)_

## What the source says

> R-125/R-290/R-134a/R-600a (55.0/1.0/42.5/1.5) | ICOR AT-22 | R/N | 0 | 2,530 | A1 | <https://www.govinfo.gov/content/pkg/FR-2006-03-29/pdf/06-3030.pdf> March 29, 2006 (pdf) (181 KB) | Acceptable |

## Source

- https://epa.gov/snap/substitutes-residential-and-light-commercial-air-conditioning-and-heat-pumps

Last verified: 2026-08-11. Review by: 2027-08-11.
Part of [HVAC refrigerant replacements: retrofit compatibility, safety class, GWP and lubricant](https://referencesource.org/hvac-component-refrigerant-compatibility/).