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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AC works basically by compressing and decompressing a coolant. You decompress (cool) on the side you want cold, allowing it to absorb heat, and compress (heat) on the side you want to dump the removed energy (heat) into.
It’s easier to develop a system to handle a single standard compression rate and pressure system than it is to develop one that can do variable rates.
Also if you find an optimal rate, it’s better to use that and just bring the temp down to the target, as opposed to using less optimal (energy inefficient) rates of compression and decompression.
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