How to Size a Window Air Conditioner

Don't buy a more—or less—powerful unit than you need

Size matters when you’re buying a window air conditioner. An AC that’s too small will struggle to keep the room at a comfortable temperature; a model that’s too big will cool the room too quickly without removing enough humidity from the air.

Choose just right and you’ll feel just right—and save money, too. Consumer Reports tests air conditioners in rooms that are the same size as the ones they’re intended to cool. That makes it easier for you to select the best model for your needs.

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