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The main difference between 1-stage and 2-stage cooling systems lies in the operation and capability of the cooling intensity. In a 2-stage cooling system, there are two levels of cooling output: a lower stage for maintaining comfort during milder weather and a higher stage for hotter days. This dual capability allows for greater flexibility and energy efficiency, as the system can operate at a lower capacity most of the time, reducing energy consumption and providing more consistent temperature control.

By contrast, a 1-stage cooling system can only operate at a single capacity, turning on and off to achieve the desired temperature. While this can be sufficient for some situations, it may lead to inefficient energy use during less extreme weather, as the system doesn't adjust its output to match the cooling demand. Consequently, selecting a 2-stage system can provide more comfort and efficiency, particularly in regions with varying temperatures throughout the cooling season.