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If there is something missing in most wine cellar coolers, it is humidity control. Many people just don't realize they need to control humidity as well as temperature in their cellars. However, humidity is crucial to fine wine storage. Why? Because humidity helps keep the cork moist, even on the dry side. In a cellar with no humidity, the dry side of the cork can dry out even further, and "capillary pull action" can actually pull wine through that dry cork and eventually add air to the bottle. This can produce a moldy wine. Corks won't dry out in the right humidity conditions of about 65 percent. That's why humidity control is part of the whole picture when it comes to wine cellar coolers.