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If you don’t have central air, and a window AC isn’t an option, get the LG LP1419IVSM portable air conditioner—the quietest and most efficient unit we’ve found after researching over a hundred portable air conditioners and testing more than a dozen.

Most portable ACs are pretty similar, but the LG LP1419IVSM delivers better cooling performance than other models, yet it uses less energy, makes less noise, and can dial in a more precise comfort level than other models. The difference is in its dual-rotor, DC-powered compressor, a contrast to the alternating current found on most air conditioners.

Rather than running only at max speed or nothing, the LG can operate at a continuously variable speed, so the unit has a lot more flexibility in how it reaches a desired temperature in a wide range of temperature and humidity conditions. The LG had the lowest volume measurements on any machines we tested, and other nice (but not unique or essential) features—like compatibility with Google Home or Amazon Alexa, smartphone control via LG’s app, and a remote—give you a lot of options for how to operate it.

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