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It mixes partial air from outside, instead of recycling just inside air (which is already cool probably, and thereby easier to make even colder.)

Some window units have 3 options. Closed, Vent, and Outside. Outside is 100% outside air, and doesn't use any of the already cooled air inside your home to recycle and make colder.

Both vent, and outside settings can be rough on an ac unit, if it's hot out, and especially if the humidity is high.

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12y ago

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