If you have a window opening into your cellar, you might want to consider sealing it off, or using it to vent any cooling unit you might use for the space. Most windows are relatively inefficient insulators, generally having thermal leaks around the seals, and they obvious let unwanted light into your cellar.
The same goes for your doors, though I know we all love to be able to see and display our prized collections, even the best triple thermopane windows aren’t as good an insulator as a solid, well insulated door. Having said that, I admit to sometimes wanting a glass pane in my door, but the view that I am treated to each time I swing the door open and flick on the lights (they’re fluorescent, so at cellar temperatures the light comes on slowly and dramatically) is enough to banish such thoughts from my head!
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