It cools my bedroom very well and its noise level is normal. Not very loud at all. Moderately! There's a learning curve because you have to remove the chassis from the actual air conditioning unit inside to install the top and bottom brackets and two sash window insulators that don't come pre-installed. It was totally unexpected and if I had known that I would not have bought it. It took some work and the manual was printed in an old cheap newspaper, black and white and not very legible. Photos very badly done. This thing is heavy. Therefore, you will need help to remove the AC unit from the case and attach it to the window. My wife wasn't a happy helper and I can't blame her, but she was all I had. lol! The economy mode was annoying. It turned on and off intermittently, quickly, and constantly. I just turn it off so it works all the time. So I'm not sure I can call it energy efficient in the long run, but it's bloody cold!
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