There can be dozens of air conditioners on the roof of a school. And they have t...

		JoeAltmaier on June 12, 2015 \| parent \| context \| favorite \| on: 1980s computer controls Grand Rapids Public School... There can be dozens of air conditioners on the roof of a school. And they have to be cycled on and off all day long as they cool the building, else it'll turn into winter in there. Definitely a fulltime job for somebody. That's why we have thermostats.