Even though our bedroom is larger than the recommended 150 sq. ft our GE 5,000 BTU window air conditioner is perfect. In our upstairs apartment the master bedroom is right off the living room, which has a huge wall unit that helps cool the whole apartment. Unfortunately the bedroom is also directly above our neighbor's front porch, which is not cooled by their central air and gets scorchingly hot in the summer. Our GE air conditioner was the perfect choice: quiet, efficient, and easy to install.