A 2-stage compressor is one compressor with 2 stages. One compressor with a small compressor operates most of the time for maximum efficiency, handing off to the larger compressor when extra cooling is needed.
It is a compressor that can adjust to a lower stage when demand is low and high stage when the outdoor temps are more extreme.
It uses less energy when demand is low and adjusts to the higher stage only when the outdoor temps are extreme.
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