My closets aren't big enough for my server rack since it isn't really a traditional rack, but a shelf with ATX cases and whatnot on it. The problem is that all those servers running 24/7 makes the room warmer than all the other rooms.
That is part of the reason I'm building a new
Blue Iris server in a Mini ITX case. It'll be easier to move out of that room, and take 130 watts of heat with it.