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Originally Posted by aleck
most air cond. systems are not taking outdoor air. just cooling/heating the air inside.
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You're absolutely wrong. If that was the case you wouldnt need to keep it at a window.
AC units use the outside air to help cool the unit down, intake cold air from outside, run it over the internal parts and spit out heated air (back to outside).
If it worked any other way then the air which gets heated by the AC would be pumped back into the room which it is trying to cool and would more or less be useless.