In our portable air conditioner tests, we measure how long it takes a unit to lower the temperature of a test chamber from 90° F to 85° F. That takes an average of 20 minutes. By comparison, the best window air conditioners can cool the room by 10° F in about 15 minutes or less.
For brownout tests, we set the AC to its lowest temperature setting on cool mode with the fan speed on low. We then start the AC with the compressor on and lower the voltage to 100 volts. We test the unit in a room set to 90° F while the outdoor temperature is 120° F, letting the unit run for 40 minutes before cutting the power entirely. After 3 minutes, we restore power and let the unit run for an additional 20 minutes. These testing procedures help us determine whether the unit will turn off or fail to restart due to the reduced voltage (which results in increased heat buildup within the unit).
For noise tests, we position the AC near the test window and measure noise levels on both high and low fan speeds when set to cool mode.
In CR’s brand reliability survey, two brands—Frigidaire and Honeywell—earned a top rating for predicted reliability, and two other brands rate above par. Owner satisfaction, which is based on the proportion of our members who are extremely likely to recommend their AC, wasn’t quite as high, with most brands earning a midlevel rating.
We test portable ACs from over a dozen brands, such as Emerson, Friedrich, Frigidaire, Honeywell, LG, Midea, Whirlpool, and Whynter. If you’re looking for additional information on portable ACs, check out our air conditioner buying guide.
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