Recognizing that a central air conditioner is nearing the end of its operational life involves monitoring several distinct performance failures. Major warning signs include frequent mechanical breakdowns and costly service calls, rising monthly electricity bills caused by declining efficiency, strange grinding, squealing, or banging noises coming from the outdoor compressor, uneven cooling across different rooms in your house, and rooms that never quite reach the target thermostat setting. Verification: Evaluate repair costs against the age of your system to determine if replacement is necessary.
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