To maintain optimal performance, it is recommended to keep a Sub-Zero wine cooler at least 5 to 10 feet away from direct sunlight. Sunlight exposure can lead to temperature fluctuations inside the wine cooler, causing it to work harder and potentially affecting the quality of the stored wine. Direct sunlight can also cause the wine cooler's exterior to heat up, impacting its overall efficiency and potentially causing unnecessary wear on the cooling system. Placing the wine cooler in a shaded or darker area of the room will help ensure a more stable temperature environment and protect the wine from sunlight's harmful effects.