On Tue, 10 Aug 2004 11:48:06 +0100, a particular chimpanzee named "David W.E. Roberts" randomly hit the keyboard and produced:
There is a maximum Carbon Performance Rating (essentially a limit on the energy use) of ventilation and air conditioning systems for commercial buildings over 200m². It's not very stringent at the moment, but it's likely to be decreased over the next few years.