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In fact, with both the compressor and the fan on high, we had trouble measuring any volume difference at all. The compressor did produce a fuller sound than the fan-only setting, especially on the lower end of the spectrum. But overall, the effect wasn’t unpleasant, and the Midea Duo was still slightly quieter than the other inverter-style portable AC we tested, the LG LP1419IVSM, and 2 to 5 decibels quieter than most of the other models we tested. The only exception to this trend was one of our also-great picks, the Frigidaire Gallery Cool Connect GHPC132AB1, which surprised us with measurements about 1 or 2 decibels quieter than what the Midea model produced, despite its use of a standard (non-inverter) compressor. But the Midea’s compressor design means that the initial difference in sound between fan-only mode and cooling mode is much less abrupt than it is on the Frigidaire.climatisation You don’t hear that distinct “Clunk! Bu-zzz-ZZZ!” as it shifts into gear as on other portable ACs; in fact, if the Duo’s fan is running on high, you probably won’t even notice when it’s actively cooling.The hose of the Midea Duo pick, shown attached to a window. The hose of the Midea pick, showing the separate conduits for intake and exhaust. The parts of the Midea pick, shown disassembled on the floor of a room. The Duo’s swinging fan is a rotating cylinder that sits on top of the unit and does an impressive job of spreading the cool air around the room. In our tests, we measured the temperature from 3 feet directly in front of the AC and 6 feet away on a diagonal, and the Duo was mostly able to retain a consistent temperature within 1 degree between those two thermometers. We say “mostly” because the fan actually hurled some of the cold air over our 3-feet-away thermometer, which initially led to some inconsistent readings. Once we figured out what was happening, it made sense and actually helped to demonstrate the Duo’s impressive air-circulation prowess. After all, cold air is heavier than warm air and thus tends to sink to the ground sooner. But the Duo was able to send those initial gusts of air far enough to ensure that the cold air actually spread before it sank. Anecdotally, we could feel that physical difference in the room, too. In addition, the Midea Duo’s hose (which is technically two hoses in one) is built directly into the AC’s rear side, in a design that can compress like an accordion in a vertical orientation that sits nearly flush with the unit. This design is easier to manage than the hoses on other models we tested—some project awkwardly out of the back, sit perpendicular to the unit, or are completely detachable so they must be stored separately and can be misplaced. The fact that this hose is anchored to the body of the AC by default also makes it easier to wrangle when you’re trying to set the AC up (thus helping you avoid the frustration of securing the hose into the window only to realize that you accidentally pulled it out of the AC, trapping yourself in a clumsy tug-of-war with an exhaust hose). To further aid in that easy installation process, the Duo also comes with more window-panel attachment options than any other portable air conditioner we’ve ever tested. We’re not even entirely sure what kinds of windows the attachments are designed for—there were only so many windows in our home to test them on. Suffice to say, the Midea Duo is more likely to have the hardware that you need for your particular situation, whatever it may be.