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This guide shows how to know if your AC is broken, starting with a 60-second triage of the most common signs and what each one usually means. You'll learn a two-minute temperature test, the free checks to run before calling anyone, and how to tell a broken system from one that's just struggling in a heat wave. It also shares patterns homeowners report on forums, explains when to call a pro now versus later, and gives repair cost ranges. A short prevention list helps you avoid repeat breakdowns.