Iron rule of fridges/freezers. The more stuff you cram in them, the less energy you use. 90% of what you shove in there is water, and nothing else has the specific heat capacity of water.
The low-functioning types at deer camp wonder why Dad & I fill gallon milk jugs with water and put them in the boxen when we leave. Every year I try to explain specific heat and thermal mass; it never sinks in. They just wonder why the power bill is so high with empty boxen.
Camp stays "open" year-round, so the main fridge is always on. It's my bug-out place. I've got keys.
What we have today is way too much pluribus and not enough unum.