A refrigerator includes a grille fan assembly provided behind a storage space and shielding an evaporator, and a machine room independent of the storage space. The grille fan assembly includes a case with an open front, a fan configured to force an air flow between the storage space and the heat exchange space, a grille panel shielding the open front of the case and having a discharge port for discharging cold air to the storage space and a suction port for suctioning air from the storage space, a partition dividing of the case into a cold air flow space and a heated air flow space, an exhaust member extending from the case to the machine room and communicating an inside of the case with of the machine room, and a machine room exhaust damper configured to open and close the exhaust member.