The unit cools well. The only issue I have is with the vibration of the unit. It's like something in the fan is out of balance.. vibration was so bad it rattles the air filter in the frame. I solved this by putting a piece of sponge foam against the filter to help dampen it. If I am sleeping I put it in the quiet setting. I do like the design and figured it would have a few bugs to work out. I considered that when I purchased it. Install was a breeze. Also there's not much fear of it falling out of the window.