The condensing unit (contains a compressor) on the box is rated for
134a. The guy at the shop uses 416a, which he's had good results. I've
got some 414b, which is supposed to be bisexual, replaces 12 or 134a.
Might try that, next time I get called to the store. I suspect it's got
better heat carrying ability.
Christopher A. Young
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If it's a compressor rated for R134a, it should handle any R12
replacement. I use R416a in systems designed for R12 and it works