Whereas a typical window air con unit is a stable steel field, the Midea U has a notch, roughly the width of a window, that runs the size of its physique. Consequently, half of the unit sits inside your residing house whereas the opposite stays exterior, with the 2 halves separated by your window. All of the noisy parts—those that in a normal AC would often rattle away inside your bed room in a symphony of growls and screeches—keep on the other aspect of your window, insulating your room from the sound. The Midea U is the quietest (and most energy-efficient) AC unit that Wirecutter has ever examined, and it’s the one air conditioner I haven’t needed to show off in the midst of the night time.