And later in "Summer Knight", as Harry enters the building of the meeting of the White Council:
The building had the look of an old-time theater—high, arched ceilings, floors of polished stone laid with strips of carpet, and several sets of double doors leading into the theater itself. The air conditioning had probably been running full blast earlier, but now there was no sound of fan or vent and the building inside felt warmer than it probably should have. None of the lights were on. You couldn't really expect even basic things like lights and air conditioning to keep running in a building full of wizards.
So it seems that other wizards have trouble with modern innovations.
