Under normal operating conditions and moderate summer weather, a properly sized air conditioning system should run for approximately four to eight hours spread across multiple cycles throughout a twenty-four-hour period. During peak summer heat waves or exceptionally high humidity days, it is completely normal for an AC unit to run longer, potentially operating continuously for twelve hours or more to maintain the desired indoor temperature. If your air conditioner runs non-stop 24 hours a day without ever cycling off, it usually indicates an underlying issue, such as an undersized unit, dirty air filters, blocked condenser coils, low refrigerant levels, or severe insulation leaks in the home that allow conditioned air to escape rapidly.
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