So this air conditioner works fine. It's not adequate for a large room, but for a small room, especially as an adjunct AC to help a main AC keep up on hot days, it works well. It's pretty heavy, and be VERY careful not to touch the back fins, because they are sharp and they will cut into your fingers. (Ask me how I know.)Assembly in a window is pretty straightforward - after putting the top rail and side fins on, you position it in an open window and close the window on the top rail. However, it's precarious - the instructions say to just put it slightly outside of the window ledge ... in an open window ... when it is very heavy to the back ... so doing it by myself I was just picturing it tumbling several stories to the ground below before I could secure it with the closed window.I actually put a notebook under it on the outside ledge to keep it from falling backwards, which I then had to reach around from the neighboring window and retrieve. So, it would be better if it had little feet or something. It also tells you to make it slightly tilted back a few degrees, and a built in level would help that a lot. So it would be better with a few modifications to make installation easier, but once it's in that is no longer an issue.Also, it's pretty loud. That didn't bother me, but it did bother my husband ... if you like white noise, this'll be great for you! If not, well, you may want to pass.