When servers overheat – they tend to react badly. Thats why you should use temperature monitoring hardware to help maintain an appropriate watch on temperatures in your computer room. Devices such as the Sensatronics EM1 available from Openxtra can be attached to your network and with the appropriate temperature probes attached can be monitored through software and alerts can be sent to your mobile phone !
You can even look at the temperatures across the web. A cost effective and straightforward way of staying out of trouble.
A note that special probes can be used in cold stores and chill stores to monitor negative temperatures !!