I believe freeze 12 is a direct drop in no changing required but I dont know what its cooling capacity is compared to freon. R12 is as good as freon BUT it needs to go through the compressor faster than freon to keep the same qualities of freon. Not too many ways to speed up a compressor that I know off so cooling power will be around 85 to 90% as effective as freon. Maybe not a problem in cooloer climates but us boys down here need the real thing.
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