Unless the compressor was failing/has failed and needed to be replaced anyways (in which case you'll need to find out why it failed), it's more economical to do the "Davuluri Treatment" by changing the refrigerant and expansion valve. Use ES12a (and a R134a TXV) for a R22 compressor and ES22a/R433b (and a R22 TXV) for a R410a compressor. Tune the exact charge by aiming for 10-15F of subcooling.
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To my surprise, shortly after Naomi Wu gave me a bit of fame for making good use of solar power, Allie Moore got really jealous of her...
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