The best thing to reduce power consumption of your chest freezer is to fill any unused space with water jug. Water doesn't move and doesn't escape when you open the lid (which is surely not 100% airtight).
Another benefit is if there's a power outage your freezer will stay cold a lot longer.
It would also be interesting to see the savings based on 1 year, but if you're gonna do some tests be sure to give your water jugs time to freeze completely
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