This ac model cools my apartment beautifully! It doesn't take up much space in the living room, my most central room. The instructions should include that you need to use duct tape to make sure both connections  (exhaust at the back of the machine and where the exhaust tube attaches to the window insert) are sealed tight! Without being fully sealed the machine will not function fully. It's wise to add duct tape to where the plastic insert meets the edges of the sides of the window. If you're not liking the silver duct tape, it now comes in a variety of colours I discovered.
The instructions could also add that you need a pail for the drainage tube to catch the water from the dehumidifier. The built in dehumidifier is awesome! I can happily breathe in my apartment again! The machine is most effective when I shut the doors to other rooms that I don't need open all day eg. bathroom, spare bedroom.