Thirty years ago, essentially all AC systems (residential or
commercial) used R-22. Please let us know what you're trying to do.
Are you a service tech?

R-134A was not used in any signifigant ammounts till 1993 or 1994.

--

Christopher A. Young
You can't shout down a troll.
You have to starve them.
..

"Junior Brown" wrote in message
. ..
What type of AC refrigerant might be used in a 30yr old (GE brand)
residential system? R22..R12? Do newer systems use R134?

Thanks,

Bob