My bedroom is in an attic space and it gets HOT. This air conditioner cools my bedroom super fast! It comes with easy to understand directions and the assembly required is quick and minimal. 

I’ve tried to blow the air into the hallway and stair well. There is no door at the bottom of the stairwell but I did put up a heavy plastic shower curtain right up to the doorway to see if maybe I could contain the cool air. It does not seem to have the ability to cool alllll that space but that doesn’t change my 5 star review because I’m pretty sure it’s not supposed to be able to cool that amount of space anyway) I regret nothing