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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Refrigerants need to be managed at a specific pressure in order for it to vaporize. Being able to vary the amount of refrigerant kept at pressure takes a bit more machinery so more expensive. The cost of a variable condenser is considerably more so not a lot of call for them in places like houses. However when you move into commercial applications you can use a vrf system that can deliver to multiple indoor units, with less refrigerant sent at times this the need for modulating systems. Or you can use a system that has more than one compressor that can use 2 stages, one for a low amount and second for higher. These are common in commercial.
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