Cooled a 20' x 25' bedroom with attached master bath from 86 degress to 65 degrees in 5 hours and maintained that temp steadily throughout the 90 plus degree days. This unit was installed in the bathroom window due to lack of outlets close to main room windows. Unit was not directly vented into the bedroom due to window location and vent direction limitations but cooled excellently regardless of the extra work it had to do. Unit is a tad loud but not excessive enough to hamper sleep.