Slower Rate Cooling
Standard AC units are built to cool the air quickly and to draw the humidity out of the air to make the room feels comfortable. However, it is the worst thing for wine maturation, cause the humidity helps to keep corks moist. Wine cellar cooling units are designed to cool the air at a much slower rate to maintain a constant humidity in the room. In many cellars humidification component can be added to raise the humidity if wines are stored in a dry place.