# R-704 helium — HVAC refrigerant replacements: retrofit compatibility, safety class, GWP and lubricant

For R-704 helium, gwp is 1; compatible lubricant is PAG; listing status / notes is Copeland ZC scroll models only, verified against its source on 2026-08-11.

- **Refrigerant:** R-704 helium _(verified: appears in the quote below)_
- **GWP:** 1 _(verified: appears in the quote below)_
- **Compatible lubricant:** PAG _(verified: appears in the quote below)_
- **Listing status / notes:** Copeland ZC scroll models only _(verified: appears in the quote below)_

## What the source says

> R-704 helium 1 Cryogenic PAG Copeland ZC scroll models only

## Source

- https://webapps.copeland.com/online-product-information/Publication/LaunchPDF?Index=AEB&PDF=93-11

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/).