Re: spider air conditioning

[Mark Denovich <mark@domain.elided>]

There is an alternative to more R-12 or converting to R-134a.   An 80% 
mixture of propane and 20% iso-butane is a direct replacement for R-12. 
 It's actually even a bit better (colder) than R-12.   It's approved 
for stationary uses, but was outlawed for use in passenger vehicles... 
one might argue that it was largely outlawed at Dupont's request (the 
maker of R-134a) as the propane/iso-butane mixture is used in passenger 
vehicles Europe and Austrailia with great success.

For some reason I find the chemistry of refrigerants fascinating.

	--Mark
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