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Most home systems use R-22 refrigerant. R-410a, known as PURON, is also an increasingly used refrigerant.

If you see a pink sticker on the outdoor unit, it will say on the tag with the model and serial numbers r22 or 410a.

"Freon" is a trademark of DuPont, and is NOT the real name of refrigerant. "Freon" was R12 and is no longer made.

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