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Short answer: multiply your AC's age by the repair price. If the result is under $5,000, repair it; if it's over $5,000, get a replacement quote too. A $250 capacitor on a 6-year-old system is an easy repair. A $2,300 compressor on a 13-year-old system usually isn't. Two things push toward replacement no matter what the math says: an old R-22 system (installed before about 2010) and a system that keeps breaking down.