Leak is most likely in the a coil if one of those systems R22 exception, I buy at auctions for my licensed HVAC guy to use at my house....I would repair leak and top off every year till compressor fails......Mine was 35 years old 9.4 seer and I topped off r22 every year for the last 10 till compressor failed. now 410 gas and 16 seer....save 35% on the bill but my 3.5 ton only cost 3500 to replace with me helping I paid average of $3 a lb at auction.....sealed container 30 lbs
