What happens to air when the freezer door is open?

When the freezer door is opened, warm air from the surrounding environment enters the freezer. This causes the temperature inside the freezer to rise, which can lead to condensation and frost buildup. The freezer's cooling system will then work harder to lower the temperature back to the desired level, increasing energy consumption. Additionally, if the door remains open for an extended period, it can lead to spoilage of stored food items.