An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Significant New Alternatives Policy (SNAP)

Accounting Tool to Support Federal Reporting of Hydrofluorocarbon Emissions

This document provides technical documentation to support the HFC Tool. It summarizes the six emission estimation approaches included in the HFC Tool and describes in greater detail the underlying assumptions and calculations used in the two new approaches developed by EPA specifically for inclusion in the tool.

You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.