A washer dryer and method for controlling the same may improve a structure of air circulation and increase dehumidification efficiency, thereby reducing drying time. A cooler fan is operated to prevent overheating of a washer dryer in the drying course, which reduces faults of the washer dryer and thus reduces user inconvenience. Overheating of the washer dryer may be prevented in advance in the washing course, which maintains washing performance and prevents delay of cooling time, leading to increased drying time accuracy and thus user satisfaction. The cooler fan is disposed on the tub to vent the air in the dryer (dry air) outside the cabinet to allow high temperature and high humidity drying, thereby increasing drying performance. A hole disposed on the bottom of the dryer sucks cool air into the inside of the dryer from the outside, and air circulation rate and dehumidification efficiency may be increased.