Split cellar coolers have two parts—an interior evaporation unit and an exterior condenser. A through-the-wall wine cooler is a self-contained unit, similar to wall a/c units in homes and apartments, but with a much sleeker design. Split cellar coolers can cool a space from 500-3,000 cubic feet, depending on the model and the configuration of the space. If there are multiple rooms within your cellar or obstructions that restrict the flow of air in one or more parts of the room, you may need multiple split system cooling units. Conversely, through-the-wall units may not be enough for large cellars or for wine rooms in regions with extreme temperature fluctuations. Through-the-wall units are also noisier for split systems, since these self-contained systems include the compressor and fan. However, there may be ways to reduce the amount of noise and vibration from a through-the-wall unit.