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When to replace AC unit equipment is easier to decide with a clear process. This guide gives you three quick tests, a seven-question scorecard and worked examples of the 50 percent and $5,000 rules, plus their blind spots. It explains why old R-22 systems tip the balance, lists the warning signs that a unit is near the end, and shares patterns homeowners report on forums. A final section covers sizing, ducts, quotes, timing and cost.