Wow just found this old thread as I did a search before making a new one. Seems our server room is one of the coolest on here then @ 16c. We have a very good air con system in there after years of failures and hassle with our old one. My old job, the server room there I literally had to wear a coat in, so I'd say it was nearer 5-10c. Not sure why they had it that cool, but it was a government building with some ridiculous servers in.