Abstract: A heated ventilation door for a potato storage facility or the like is described comprising a door pivotally mounted in a support mounted in an opening formed in one wall of the storage facility. The door includes a hollow peripheral frame having heating fluid contained therein which is heated by an electrical heating element in communication therewith. The heating element is controlled by a thermostat to conserve energy and is also controlled by a mercury switch which deactivates the heating element when the door is in its open position. When the door is in its closed position, the heating element heats the heating fluid in the peripheral frame at the location of the heating element in the peripheral frame causing the heating fluid to circulate around the peripheral frame.