At the Scottsdale NANOG Spring 2001 I asked for volunteers to install temperature and humidity data loggers in their colocation facilities. I wanted to determine what are "typical" colocation enviromental conditions. I was tired of people asserting all sorts of numbers as the required conditions for a colocation facility. Although I haven't received all the data loggers back (if you have one I still want it back), I have posted the data I collected on my personal web site. http://www.donelan.com/ The sample is too small to be useful, but it is data.