The main reason that server rooms get so hot is that they contain so much electronic equipment that generates serious amounts of heat just from doing what they're supposed to do. We're talking about servers, switches, and other essential hardware that make up the not-so-mysterious server room. Over the past decade, server room setups seem to have gotten denser, which means more hardware concentrated in the same small, usually unventilated, space. On top of that, if the cooling system isn't adequate or isn't working properly, it's not going to be long until the temperature in the server room climbs to the level of discomfort, if not outright danger, for the equipment within.