Seriously. The ducting for the furnace doesn't quite heat this room well if at all. During the cold season (ie: now - it's 3 degrees F out right now) this room is quite chilly -- assuming I don't have the computers on. If I turn the machines on and leave them all day with the door closed, well, right now it's a comfortable 77 degrees in here. All thanks to a 1.4GHz TBird and a 1.2GHz Duron. 