I haven't researched this to validate it - but, I have heard rumors to
the effect that R12 has turned out not to be the bugaboo it was first
thought to be, and that 134a is now known to have issues making it at
least equally bad as R12,  So, as you say - chose  your poison.

John

John Rodgers
Clayartist and Moldmaker
88'GL VW Bus Driver
Chelsea, AL
Http://www.moldhaus.com

On 5/24/2011 9:12 PM, Jeff Schwaia wrote:
> global warming (climate change in PC terms) over a hole in the ozone layer... Name your poison: R134a = greenhouse gas; R12 = CFC.
>