Home » Employing Freon Employing Freon February 20, 2009 Reprints No Comments In 1933, Westinghouse a/c units begin using F-12 (Freon). Did you enjoy this article? Click here to subscribe to The NEWS Magazine Related Articles App Zone: May 26, 2014 1930s Bring A/C Into the Mainstream Young Techs Talk Up the HVACR Trade You must login or register in order to post a comment. Report Abusive Comment Thank you for helping us to improve our forums. Is this comment offensive? Please tell us why.