"Most data center temperatures are a legacy of the days when computer equipment was sensitive to even moderate heat and computer rooms were routinely chilled to the 60s. “I was recently in a mid-size data center that was so cold the operators were wearing sweaters when they were inside,” says Rich Fichera, a vice president and principal analyst at market research firm Forrester Research."
— World’s Data Centers Refuse to Exit Ice Age | Wired Enterprise | Wired.com