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A door assembly for a home appliance includes a door that opens and closes a heating chamber. The door may include a first plate and a second plate, the first and second plates forming a first air gap in the door for insulating heat in the heating chamber. Additionally, a valve may be provided in th

A door assembly for a home appliance includes a door that opens and closes a heating chamber. The door may include a first plate and a second plate, the first and second plates forming a first air gap in the door for insulating heat in the heating chamber. Additionally, a valve may be provided in the door, the valve may selectively allow air outside the first air gap to communicate with the first air gap.

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What is claimed is: 1. An electric oven comprising: a case; a heating chamber in the case; a door that opens and closes the heating chamber, the door including a first glass facing the heating chamber and a second glass located proximate the first glass, and the first and second glasses forming a f

What is claimed is: 1. An electric oven comprising: a case; a heating chamber in the case; a door that opens and closes the heating chamber, the door including a first glass facing the heating chamber and a second glass located proximate the first glass, and the first and second glasses forming a first air gap in the door; a valve provided in the door, wherein the valve is selectively operated to allow air inside the first air gap to be discharged from the first air gap to cool the door; and a lock that selectively locks the door, wherein the valve is operatively coupled to the lock such that the lock controls movement of the valve, the lock comprising: an actuator and a rod operatively coupled to the actuator, wherein the rod moves the valve to open the first air gap when the door is locked, and the actuator being mounted in the case and configured to either one of swing and push the rod to hook the door and push the valve. 2. A door assembly for a home appliance, comprising: a door that opens and closes a heating chamber, the door including a first plate and a second plate which form a first air gap in the door to insulate heat in the heating chamber, the door including a third plate provided proximate the second plate to form a second air gap in the door through which air flows to cool the door, and the first air gap being positioned between the second air gap and the heating chamber; a valve provided in the door, wherein the valve is selectively operated to allow air inside the first air gap to be discharged from the first air gap to cool the door; and a lock that selectively locks the door, wherein the valve is operatively coupled to the lock, wherein the valve comprises: a first member that opens and closes a portion of the first air gap, a second member movable along with the first member, and the lock configured to move both the first and second members, and a pivot about which the first and second members rotate together when the lock engages the second member. 3. The door assembly for home appliance of claim 2, wherein the lock comprises: an actuator; and a rod operatively coupled to the actuator, wherein the rod is configured to move the valve such that a portion of the first air gap is opened when the door is locked. 4. The door assembly for home appliance of claim 2, wherein the valve further comprises: an elastic member configured to allow the first and second members to return to an initial position of the first and second members. 5. An electric oven comprising: a case; a heating chamber in the case; a door that opens and closes the heating chamber, the door including a first glass facing the heating chamber and a second glass located proximate the first glass, the first and second glasses forming a first air gap in the door, the door including a third glass provided proximate the second glass to form a second air gap in the door through which air flows to cool the door, and the first air gap being positioned between the second air gap and the heating chamber; and a valve provided in the door, wherein the valve is selectively operated to allow air inside the first air gap to be discharged from the first air gap to cool the door, and a lock that selectively locks the door, wherein the valve is operatively coupled to the lock such that the lock controls movement of the valve, the lock comprising: an actuator and a rod operatively coupled to the actuator, wherein the rod moves the valve to open the first air gap when the door is locked, and the actuator being mounted in the case and configured to either one of swing and push the rod to hook the door and push the valve. 6. The electric oven of claim 5, wherein the door further comprises: a supporter which supports the first, second, and third glasses thereon, wherein the supporter is configured to permit air to flow into the second air gap while preventing air from flowing into the first air gap. 7. The electric oven of claim 5, wherein the valve comprises: a first member that opens and closes a portion of the first air gap; a second member movable along with the first member, and the lock is configured to move both the first and second members; a pivot about which the first and second members rotate together when the lock touches the second member; and an elastic member which allows the first and second members to return to an initial position of the first and second members. 8. The electric oven of claim 5, wherein the valve permits the air to flow into the first air gap to cool the door when a temperature of the heating chamber reaches a preset value. 9. The electric oven of claim 5, wherein the valve permits the air to flow into the first air gap to cool the door when the electric oven performs a preset operation mode. 10. The electric oven of claim 5, further comprising a fan that introduces air outside the case into the case to cool a circumference of the heating chamber and into the door to cool the door. 11. The electric oven of claim 5, further comprising a first vent hole provided on the case, wherein the first vent hole introduces air outside the case to a proximity of a control panel to cool the control panel. 12. The electric oven of claim 10, further comprising a second vent hole provided on the case, wherein the second vent hole introduces air outside the case to a proximity of a motor of the fan to cool the motor. 13. An electric oven comprising: a case; a heating chamber in the case; a door that opens and closes the heating chamber, the door including first and second air gaps therein, the second air gap being configured to allow air to flow therethrough to cool the door, and the first air gap being arranged between the second air gap and the heating chamber; a fan provided in the case, wherein the fan is configured to allow air to flow through the second air gap to cool the door; a valve provided in the door, wherein the valve is selectively operated to allow air inside the first air gap to be discharged from the first air gap to cool the door; and a lock that selectively locks the door, wherein the valve is operatively coupled to the lock such that the lock controls movement of the valve, the lock comprising: an actuator and a rod operatively coupled to the actuator, wherein the rod moves the valve to open the first air gap when the door is locked, and the actuator being mounted in the case and configured to either one of swing and push the rod to hook the door and push the valve.