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R-12 hasn't been produced by any nation signatory to the Montreal Protocol for several years. If you can buy 12, it will run about $30 per pound. R-410B is a direct drop-in replacement requiring no system or compressor oil change, IIRC. A 30# can is better than $300, and you still need EPA certification to make the purchase.
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There ain't nothin' more powerful than the odor of mendacity -Big Daddy
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