Red wine does not have to be refrigerated. There is not exact temperature for all red wines. Most experts agree that sixty to sixty eight degrees Fahrenheit or sixteen to twenty degrees Celsius is the best range. Some reds may have to be refrigerated but only if you are certain and have been recommended so by the winemaker. You can safely store reds in a dry and cool place that is well shielded from sunlight. You should not keep reds in any place that gets exposed to direct sunlight. You should also avoid any exposure to indirect sunlight. This is why most people prefer to keep wines in their basement or inside a cabinet.
The need for refrigeration arises when you are in the tropics. If you live somewhere closer to the tropics or in the tropics, then the temperatures during summer can easily be around thirty degrees Celsius or more. It is not uncommon for the mercury to climb up to forty degrees and closer to fifty degrees Celsius in many regions across the tropics. It is quite difficult to have a cool place at home or a commercial property in such regions and this necessitates refrigeration. Unless you have an underground cellar that is effectively insulated and you know for certain that the temperature down there is slightly lower than twenty degrees, you have no other option but to refrigerate reds.
Both high and extremely low temperatures will ruin red wines. You cannot and should not get reds to go anywhere near freezing temperatures. The wine may not freeze but exposure to near zero is bad. Reds should not be subjected to temperatures over twenty degrees Celsius or seventy degrees Fahrenheit. The chemicals in the wine will start to react and many will breakdown, effectively ruining the wine entirely.