This is a better pointer (not necessarily a good one, but it makes it easier to google for): http://www.bbc.com/news/business-39735802 http://www.bbc.com/news/b

This is a better pointer (not necessarily a good one, but it makes it easier to google for): http://www.bbc.com/news/business-39735802 http://www.bbc.com/news/business-39735802 (The article was linked from Hacker News). From the article: '''The boom in air conditioning is good news for many reasons. Studies show that it lowers mortality during heat waves. Heat makes prison inmates fractious - air conditioning pays for itself by reducing fights. When the temperature exceeds 21C or 22C in exam halls, students start to score lower in maths tests. In offices, air conditioning makes us more productive: according to one early study, it made US government typists do 24% more work. Economists have since confirmed that relationship between productivity and keeping cool.'''