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Because older A/C systems were designed to use R-12 coolant and they do not run as efficiently using R-134.<br> <br> <br> <br> Manufacture of R-12 was banned in the US due to concerns over it's adverse effects on the ozone layer.<br> <br> <br> <br> <br> <br> <br> <br> My site :: <a href="https://Physioneedsng.com/question/top-%e0%b8%84%e0%b9%8d%e0%b8%b2%e0%b8%ab%e0%b8%99%e0%b9%89%e0%b8%b2%e0%b8%9e%e0%b8%a7%e0%b8%87%e0%b8%ab%e0%b8%a3%e0%b8%b5%e0%b8%94-guide/">สู่สวรรค์พวงหรีด</a>
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