No, it is generally not normal for an air conditioner to run for 20 hours a day, except during extreme, record-breaking summer heatwaves when high thermal loads strain residential cooling systems. If your AC runs continuously day after day without shutting off, it indicates a serious operational inefficiency—such as severely low refrigerant levels, a dirty air filter choking airflow, leaky ductwork, an undersized system, or failing compressor components. Running constantly drives up electricity bills and risks freezing coils. Verification: Monitor daily runtime hours and check whether indoor supply vents feel consistently chilled.
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