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Originally Posted by michael cole
has anyone considered the "autofrost"replacement for r12?from the test reports ive read this looks like a good option with no drawbacks other than slightly higher hi side pressure at high ambient temps(+100f) which we dont encounter ever here in southern ontario
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Autofrost is a blend of many different refrigerants.
55% R-22
41% R-142b
4% isobutane
I vote for duracool. It is an HC refrigerant, made up from a blend of propane and butane. It cools as well as R-12 and actually uses a lower head pressure than R-12.