HVAC Refrigerant

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
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What does the condenser say?

Thirty year old unit may take R500.
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Junior Brown writes:

Almost certainly R-22.

No, not your typical split system. Still R-22 or (ugh) Puron.
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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.
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Christopher A. Young
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