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Deep freezers can keep items cold for an extended period during a power outage due to several key factors:

1. Insulation: Deep freezers are designed with high-quality insulation that helps retain cold air. This insulation slows down the warming process, keeping the interior cold for longer.

2. Full Capacity: A fully packed freezer retains cold better than a partially filled one. The frozen items help keep each other cold, acting as ice packs.

3. Minimized Door Openings: Keeping the freezer door closed as much as possible during a power outage helps maintain the internal temperature. Each time the door is opened, warm air enters, and cold air escapes.

4. Ambient Temperature: The temperature of the room where the freezer is located also plays a role. A cooler room temperature helps the freezer stay cold longer.

5. Backup Power Options: Some people use backup power sources like generators or battery packs to keep their freezers running during extended outages.