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If I have concrete walls, do I need to vapor seal and insulate the walls?

Yes! It is a common misconception that a concrete wall will provide enough insulation for a cold wine cellar. Concrete is actually a very poor insulator (a 12″ block has an R-value of only 1.28) and is very porous, so is not a good vapor barrier either. Therefore, a complete build out with a vapor barrier and insulation is required when concrete walls are present and you plan on actively cooling your cellar.