What part of the house or apartment would be most efficient for placement of a window unit air conditioner?

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shade side of largest room

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And on the upper level if you want cool two floors. But in that case, "most efficient" would require two units, one upstairs and one downstairs.

In fact, greater efficiencies (your question did ask about efficiency, not initial cost or practicality) can be gained with multiple smaller units in various rooms, than with one big unit.

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