It has been discovered that 55 deg. is optimum for aging. The reason you don't want the temperature fluctuations is it causes the cork to expand and contract allowing air in and possibly resulting in oxidation. Higher temps will also cause the wine to age at a faster rate. Next time you open a bottle of wine check the cork. If you see signs of seepage (wine stains up the sides of the cork, then it has been stored improperly.
If the wine has stained only the bottom of the cork then you are set! You'd be suprised to find how many liquor stores do not store their fine wines properly. I recently stopped going to one store because as I was browsing the racks looking for a wine to add to my collection I couldn't help but notice the blast of the heater blowing directly onto the bottles.
Anyway- If you don't plan on storing your wines for a long time, a rack should be fine, just make sure that they are on their sides to keep the wine in contact with the cork. If you do plan on keeping some for at least a year or more before drinking, you might look into getting a small 6 bottle or so countertop wine cooler.
Salute!
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yummm. Agree with bluue. Most reputable wine stores will store their older wines in wine fridges but for the most part, store room temperature which is usually around 70-74 is fine for short term storage. Key point is as mentioned above temperature fluctuation. A wine fridge will keep your bottles at a nice sleeping temperature and will let your wine age nice and slow. At higher temps ie room temp, you wont hurt your wine as long as you have AC. With better wines, I would recommend decanting. Its amazing what a few hours will do for a tight bottle of wine. If you're going to store anything for any extended period of time ie years, a small wine fridge will work fine but wine fridges like humidors will always become too small

We started with a vinotemp 58 bottle, needed more space so went with a 160 and we're basically out of space again and just coming back from Napa/Sonoma. Good luck and also know that winerys also make your "limited editions"

Youre starting to get into another "aged is good" hobby. G1
Oh and if you do open a bottle of wine that you purchased and the nose is like wet newspaper and or it has wine along the cork, be sure to return it and let the shop know it was corked. Of course you cant' do that many years later so thats a catch 22. Definately don't purchase any bottles where the cork looks like its protruding a little in the foil. G1