We're currently in discussion at work as to the ambient room tempertaure peak in which servers should start getting powered off.  We've been having some A/C problems.
 
I spoke to a Dell server rep who stated the PowerEdge ambient temperature operating range is 50 degrees F to 95 degree F.
 
Here are my additional questions from a computer room with 5 full racks of servers.
 
1.  The computer room can stay at 80 degrees F indefinately, the servers are fine?  (If so, why keep computer rooms at 70 F?)
 
2.  The computer room can stay at 90 degrees F indefinately, the servers are fine?  (If so, why keep computer rooms at 70 F?)
 
3.  If any answer to #1 or #2 is no then at what ambient temperature should servers be powered off?
 
If A/C is degraded or fails:
 
4.  At what ambient temperature should laptops be powered off?
 
5.  At what ambient temperature should workstations be powered off?
 
Thanks