It gives you the benefit with a cool and cozy place while leaving you with lesser cooling simple living expenses. If the air outside was cold, we didn't have to have the air conditioner, we would just open the windows and doors and let that cold air in. They come rated typically for 5000 BTUs, 7000 BTUs, 9000 BTUs and 12000 BTUs. Attain length a good exhaust hose is 5-7 feet.