completely ignoring the benefit/cost of placing frozen water in the fridge there is another big advantage to having jugs of water in the fridge. When you open the door the cold air pours out the bottom and is replaced by warm air in the room which your fridge now needs to cool down. Replace that cold air with enclosed cold water and when you open the door there is less air to fall out and need to be cooled.
I've noticed the more I've added to my cold cellar the better it is at reducing short duration temperature swings. The fridge should act the same.
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