Check out R-290, aka Propane. It's a good replacement for R-12 and R-22 (not sure why you haven't edited your original post, I'm still not clear on which one you're actually asking about). I've been running it in my home system for two years now, and aside from needing to increase fan speed due to R-290 being higher performing than the system's original refrigerant, it's been trouble free.
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