Well, one of the big advantages of Ireland is that it's the coldest country in Europe with a decent amount of transatlantic fibre running by its coast, and it has pretty stable temperatures.

Ambient temperature can be very useful if you're building a datacentre. I work for the largest hosting provider in Ireland, and our new datacentre uses the temperature differential between the inside of our pods and the outside air to do energy recovery and cooling, and it's pretty effective . I'm a developer, so I don't have all the details, but I'll ask our CTO later for the details, if I've time.