quiet, cools 800 sq feet well, high temperatures here sometimes 90 F, humidity can be hight, AC cools and lowers humidity well. Well designed for window insertion for double hung window. Follow instructions closely to install. Took me about two hours. The unit is secure in the window and sealed well with parts provided. I would buy it again. I have been using it for the last warm days of Detroit's warmest days of humidity. This is perfect since I am off the Detroit riverfront. This is ideal for lofts or any large open space. Quietest air conditioner I have ever had. Pleasant to look at and easy to install. Highly recommend this product!!