Why are air conditioners only fully on or off, instead of adjustable strength?

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Why do air conditioners and refrigerators have to keep turning on and off to keep the air within a temperature range, instead of adjusting their output to maintain an exact temperature?

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Air conditioners and refrigerators use a cooling process to regulate temperature. Maintaining an exact temperature by adjusting the cooling strength is complex due to changing heat levels indoors. The on-off cycle is simpler and more reliable, as it quickly brings the temperature down when needed. This approach ensures stability and energy efficiency in maintaining a comfortable temperature range.

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