You’ll need to use ice packs or already-chilled bottles of wine to get the temperature down to where you want it. The wine cooler has a limited ability to refrigerate and keep the temperature steady. In retrospect, I wish we had invested in a small refrigerator, and a thermometer, rather than the two-zone wine cooler we’re using now.
The ideal temperature for storing wine is 55F, give or take 4 degrees. The ideal serving temperature varies: it’s generally around 65F for red wines, and 55F or even colder for whites. The colder the serving temp, the more refreshing the wine, but the less aromatic it is. On the other hand, the warmer the serving temp, the more unstable it becomes—the aromatic qualities can be replaced by jamminess and high-alcohol smells and tastes, and overall the wine can lose its balance.