Well, I'm kind of a Watt miser and like an air conditioner, the colder you set it, the more kWh you use. The 10.5° F suits my spoilage rate fine, since the turnaround is 7-10 days as I mentioned and it takes a lot longer than that for food to spoil at 10.5° F.
Miser-wise, there are billing periods in spring and fall (12 hours daylight, moderate temps) where I can get below 100 kWh per bill. Funny story about that regarding my own stupidity for another time.
Terry
ETA: I'm in an apartment with heat and water provided.