At Consumer Reports, we test room air conditioners in a special climate-controlled chamber in our labs in Yonkers, N.Y. We adjust the size of the chamber based on the space—small, medium, or large—each air conditioner is designed to keep cool. We crank the temperature in the chamber up to 90° F, then measure how long it takes the AC to lower the temperature by 10° F.
We also gauge how well the air conditioner holds the set temperature. And because noisy air conditioners can be annoying, we measure how loud each unit is on its lowest and highest settings. We test for ease of use, which determines how simple a model is to install and operate. We also take energy efficiency into account, giving higher scores to more efficient models.
In addition to our performance tests, we ask CR members about the room air conditioners they already own. Our current ratings for predicted reliability and owner satisfaction, available to members, are based on results for 6,209 room air conditioners purchased new between 2012 and 2022. Read more in “The Most and Least Reliable Room Air Conditioners.” The survey data becomes part of the unit’s Overall Score.
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