My company is moving to a custom built office. I was asked to figure out in BTU's, what kind of heat each rack would put out, or a pretty close guess, for cooling purposes. Our 5 racks (enclosed) are 3/4 full now, with 1u servers, and a 3com switch, along with a couple of 16 disk arrays. The booklet that came with the server says it puts out about 1372 BTU an hour. We will probably be adding more servers later. So, I am guessing 40, 000 btu per hour, per rack(27 servers, and switches, ups, etc.). That just doesn't sound right, does it? I am guessing the 1372 is server at full load? That just sounds awful high. In 6 yrs in IT, sadly, this is the first time I have been asked this.