In the 1920s movie houses began promoting the benefits of air conditioning. By the 1950, window-based air conditioners were becoming common in homes. Before watching this video I had not realized the degree to which air conditioning changed society. The impact has been profound.
A Short History Of Airconditioning
Man's control of heat and cold for useful purposes changed the course of society. This interesting clipping is from a NOVA Documentary called "Absolute Zero"...