Eoin Long and Brian Kelly are giving me a tour of the Lennox Building, a serviced office development on Richmond Street South in Dublin 6 that boasts sweeping views towards the copper dome of the Catholic Church in Rathmines.  But their attention is not on the view, nor on the striking pink-blossom tree in the building’s upstairs lounge. Instead, they point to discreet cameras mounted on its fourteen-foot ceilings. The sensors can detect whether a room is occupied and relay that information to the building’s heating, ventilation and air conditioning system, ensuring that energy is used only where and when…

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