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For what it's worth: We have a 170, 2 Linux boxes, 3 Windoze boxes, 2 UPSs, and assorted networking hardware all running 24/7, along with a 40s and a D02 running as needed, all in a confined space. Instead of a dedicated air conditioner, we have a high security (steel frame with expanded metal, not wire mesh) screen door (we call the place "the cage") and a big industrial roof-mounted exhaust fan (on a speed controller, and tied into one of the UPSs). We also keep a thermometer in the room. The temperature rarely climbs above the high 70s, and if it does, we can simply turn up the fan to full blast, and it will cool off rather rapidly. We used to have a similar installation without the screen door, in our former facility. It was located under a stairwell, and instead of the roof-mounted fan, we had (following some equipment failures) a pair of 24" box fans exhausting into the stairwell. We called that computer closet "the sweatbox," even after the fans (and the same thermometer we use today) went in. In both cases, the cost of a dedicated air condititoner would have been prohibitive, mainly because there isn't any exterior wall to poke a "window" unit through. -- JHHL
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