How about taking the working parts of a fridge, rigging it to mount in on
of the sliding windows(above the stove, close to the propane) so that the
cold part is inside and the warm part is outside?  Rig a fan to blow over
the cooling fins, and you've got a good AC unit that runs on propane and
doesn't drain your battery (except for the blower, which could run off a
solar panel).  I think this would work great.  Maybe I'll even start
scouring the junkyards in search of an old fridge.

Craig

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Craig Standley                             cstand@u.washington.edu
University of Washington     http://weber.u.washington.edu/~cstand
Physics
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