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You can offset this by keeping the vertical fridge or freezer full of bottled waters if you don't use all the space. It actually makes it easier for the fridge

You can offset this by keeping the vertical fridge or freezer full of bottled waters if you don't use all the space. It actually makes it easier for the fridge to maintain temperature since the thermal mass inside is higher. The bottles take up the volume that would otherwise be cold air. The bottles help a bit obstructing the outflow of cold air as well.

LorenPechtel 4y ago
But what's the cost of cooling those bottles when they replace something that was removed? I like the idea of thermal mass in a refrigerator or freezer (it took me a while to figure out why milk at home would never last to it's shelf date--the grocery store has a huge thermal mass to it's dairy cases, the milk on the shelf gets much less exposure to warm air than the milk at home) but if you're going to eliminate dead air space I think it's best done with empty boxes, not water.