Thermodynamics
You can buy gas powered fridges, they burn gas and somehow this drives a heat exchanger
Could you use the servers heat to power its aircon?
The hotter it gets the more heat it pumps away
Another idea is SOB, or System On a Brick, all your servers would be on the outside wall, if you needed more you could pop down B&Q
Web 3.0 people could choose wireless mortar
