For people in the warmer climes or really anywhere. I believe most heat damage is done to imported wines before they are shipped to the USA. They then run the gauntlet of potential heat hazards after arriving from the shipper.
Here's a link to a short article about
The Wine Lovers Page on Cooked Wines At a restaurant the other night we ordered two bottles of the same wine that were both clearly cooked - leakage, stained cork, poor taste. It was on to the next wine. What a waste of good wine.