I bought this a/c unit new in the box from my son who didn't need it after researching the best small units. It is fantastic! Installation was a breeze (no pun intended) and it is much quieter than the one it replaced. It cools a 14x14 room easily, set on Econ at 73°. One negative: the filter was impossible to remove for cleaning. I had to remove the front panel (easy) to release the catches. After, I only insert it about 98%, just before the catches.  Now perfect.