Why should server rooms be cold?

Too much heat in a room can cause the hardware to malfunction. The servers will work harder to try and keep cool, this will slow down the server.

All hardware emits warm air from the internal fans blowing out the heat generated. If you have many servers in one room, the temperature can rise significantly. This might be OK during cooler months, but in the height of summer, the hardware can over heat and servers could crash or automatically shut down.