I gave this a five star because I think it is efficient for a 500 square-foot room which I have to cool. However and yes here it comes the however it took my boyfriend over an hour and a half to two hours to put it together. It might’ve been my own fault because I did not measure the length of the window I had to put it in at the time and where I was going to put it in my living room. So we had to have an additional 4 inches to cover in my longer window.Overall I think it is a wonderful air conditioner that cools my room just fine.  I chose white because my walls are white and blends in well.  Very efficient