# THR-03 — HVAC refrigerant replacements: retrofit compatibility, safety class, GWP and lubricant

For THR-03, retrofit / new is R/N; ashrae safety class is A1; gwp is N/A; listing status / notes is Acceptable with Use Conditions : For use in residential window unit air conditioning, verified against its source on 2026-08-11.

- **Refrigerant:** THR-03 _(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:** N/A _(verified: appears in the quote below)_
- **Listing status / notes:** Acceptable with Use Conditions : For use in residential window unit air conditioning. _(verified: appears in the quote below)_

## What the source says

> THR-03 | | R/N | 0 | N/A | A1 | <https://www.govinfo.gov/content/pkg/FR-1999-12-06/pdf/99-31544.pdf> December 6, 1999 (pdf) (226 KB) | Acceptable with Use Conditions : For use in residential window unit air conditioning. |

## 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/).