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Question DetailsAsked on 5/25/2016

How do I know if my A/C uses R22 or not?

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1 Answer


Find the nameplate, probably on the compressor (outside unit) or the frame next to it. Will show manufacturer name and model number, high and low side design pressure, rated capacity (BTU/hr or Tons) though that is sometimes embedded in the model number, voltage, etc etc - and the gas it is designed to use - may say R-22, R22, or Freon - same thing. Otherwise, if a newer unit, will most likely say R410a (the most common current refrigerant). If an oddball unit may have some other R number like 31, 34, 134, etc.

Here is an article on decoding the rating tag -

Answered 3 years ago by LCD

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