Once again, Single Point of Failure failed
It's interesting that, in an industry that can have just about redundant everything (switches, servers, firewalls, you name it), it would appear that nobody bothered to plan redundant aircon (at least, not that I can tell from the article).
I know aircon is expensive, but now the question is : how much more expensive is a day of 100% downtime ?
You might want to design a second aircon system as backup, just to be sure.