I think you are confusing using propane for the power source vs. versus
using propane as the refrigerant. Propane does work as a refrigerant as it
is easy to compress into a liquid and then let it vaporize into a gas. It is
the "latent" heat of vaporization that makes mechanical refrigeration
practical.

Dennis

-----Original Message-----
From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of
Sharon Mendonca
Sent: Monday, July 24, 2006 6:12 PM
To: vanagon@GERRY.VANAGON.COM
Subject: Propane fired airconditioning

My husband just heard from someone in Canada the other day (a mechanic) and
he said that they are already starting to convert AC units to propane,
especially on farm equipment.  He said that originally AC units were propane
then went to R12 and that didn't work too well for the environment and then
134a, which also didn't work well on conversions, so now they're about ready
to start using propane again.

  Sharon & Bob Mendonca
  88 Westy
  88 Vanagon GL