Ground temp in central Ca is 65, southern alaska is 45.
Not sure how it uses water, or how it regulates humidity.
Root cellar is NOT a fridge. It’s only good for live things like robots, apples, natural cheese and other ferments. Its ok for canned goods and wine. It operates best 45 - 55 with medium high humidity.
This is a very nice design.
For some reason my spell check insists roots are robots...