Because local operators name those two parts as the most common fast failures in this market, and the symptoms match the most common call: the outdoor unit hums but the fan will not spin, the system blows warm air, or cooling dies outright on the hottest afternoon. Capacitors start the motors; contactors switch the power; both live outdoors in Texas heat, and heat is what ages them. The diagnosis is quick and the parts are in the low hundreds, which is why they are checked before refrigerant, compressors, or replacement talk. A company that opens with a system quote before testing the two named parts has skipped the market's own first step.
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