A company that makes rather nice industrial air conditioners. They are frequently used to cool large computer rooms where the building's normal air conditioning doesn't cut the mustard. There are many models, including those that mount in the roof, those who sit on a raised floor and pump the air conditioning through the floor plenum, and chillers that cool water used in large mainframes.

There is a room where I work which has three Lieberts in it. I always wondered why that room needed so much air conditioning; I eventually found out from my boss that it once had several large VAX machines in it. Big suckers that used 220V power and put out more heat than the average star. Now the room just gets ridiculously cold if you turn them on, so we just leave them off.