Fake houses

Boing Boing: Electrical substations disguised as houses

This is a peculiar item on Boing Boing, about Canadian public utilities building fake house exteriors in the 50's and 60's to hide electrical substations.

Neat idea.

I often wonder why, at least in Brisbane, Telestra exchanges are often built like brick fortresses with hardly any windows. Wouldn't a little more natural light cut down the electrical costs a bit, as well making the building look better from the outside? Or is there some specific reason you don't want windows in a telephone exchange?