Ok, maybe I'm the only one who geeks out over this but hot damn, this video of Google's data center is schweet. They have their condensing coils right up against their racks and run their DC's at 80 degrees. At the end of the video you see their line of cooling towers, its like 2 football fields long...
I remember working on an AT&T data center and the generators for the Tier 4 dc would produce 70MPH winds when they were running these were generators the size of train engines.
I gotta add, I've never seen someone skating through a data center pushing along a cart of rack parts before...
https://www.youtube.com/watch?v=XZmGGAbHqa0&