The US has spent a ton of money on their wars in the middle east.  Did you know that $20 Billion of it annually is just on Air Conditioning?  http://www.npr.org/2011/06/25/137414737/among-the-costs-of-war-20b-in-air-conditioning  As the linked article points out, that's more than NASA's budget.
Now to be fair, that number isn't just the cost of the AC units.  It's the cost of the generators, and the fuel to power those generators, and the cost of transporting that fuel, and the cost of the lives and equipment lost as insurgents attack those supply lines.