[ceejayoz]

> In August 2008, Intel conducted a 10-month study to assess the effectiveness of using only outside air to cool a data center. The temperature range was 64°F to 92°F. Humidity varied from 4% to over 90% and changed rapidly at times. No increase in server failure was observed.

http://www.energystar.gov/index.cfm?c=power_mgt.datacenter_e...