The outdoor unit is the compressor, and it's one of the most important parts of a mini-split AC. The 2 main compressor types for mini splits are inverter and rotary. A rotary compressor turns on and off while working to maintain your set temperature, while an inverter compressor uses only enough power to reach the desired setting, then idles at that setting until more power is needed.
A rotary compressor will turn on with full power, while an inverter compressor only uses enough of its resources to reduce the room temperature to your desired setting. Many people prefer inverter compressors because they save energy by not constantly turning on and off. Most new ductless mini splits use inverter compressors.
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