On Thu, 30 Aug 2007 20:23:22 -0700, wrote:


I've several old engineering manuals that put ammonia gas as #1 for
overall efficiency. Nasty stuff, but still used for large warehouse
and ice-making operations. Also biodegradeable and ozone-friendly.
You probably won't find the information you need out of a catalog,
efficiency depends on a lot of things, one reason the books are so
thick...

Stan
But have you ever been near a leaking SO2 system?
Gerry :-)}
London, Canada