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Freon: R12 vs R134 vs R406A

Just a quick note on the costs of converting to R-134 in our politically incorrect R-12 AC systems -

There was quite a bit of discussion on this on the News lists a few years back.

There is a replacement refrigerant for R-12 that is ozone friendly and works in R-12 systems. It was developed (and patented) by George Goble at Purdue.

Initially called ghg-12, it is now called R-406A and has been EPA approved for stationary (non-auto) applications. The inventor has stated that use for autos should be approved in September - as long as new fittings are added to the AC so that there won't be confusion as to what type of gas is in the system.

For more info you might want to check out 
http://worldserver.com/R-406A/
or
http://ghg.edu.purdue.edu/ghg2.html

Initial info that I heard reported that it worked better* than R-12...