Two Questions about Window A/C Units

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Dan is incorrect here, a window AC recirculates the same air from the room back into the room. Some window AC units have a vent that can be opened to mix some outside air with the room air, but it usually is a pretty small volume compared to the recirculated air.
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Larry Wasserman Baltimore, Maryland
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Some window units have an air exchanger. Which opens a little (typically two inches by two inches) trapdoor between the indoor air flow and the outdoor air flow.
There is usually a dial or switch to open the air exchanger. Without such a control, it's indoor air and outdoor air. And neer the twain shall meet.
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Christopher A. Young
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I've serviced a couple dozen (or more?) window AC. And none of them took all the air from outdoors to blow indoors. Some have a small trapdoor.
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Christopher A. Young
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This group is alt.home.repair.
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