Refrigerant 12, DuPont, the ozone layer scam, and why air conditioners suck now
(media.greatawakening.win)
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R-12 and R-22 refrigerants were the best. They are the most efficient for cooling and best in lubricity for compressors. Unlike R-134 and newer refrigerants that are carcinogenic if you are exposed. The funny part is that R-12 and 22 continue to be used in China.