The only air conditioning related trivia I know: It was the late actor Tony Randall’s favorite technology. No, not exactly required knowledge.

While AC may not have been quite as revolutionary as the washing machine, it certainly changed life in industrialized societies dramatically. From Henry Grabar’s Salon article, “How Air Conditioning Remade Modern America“:

“The environment has changed too: Summer in the city isn’t as hot as it used to be, thanks to air conditioning. When Jane Jacobs described the ‘sidewalk ballet,’ fewer than 14 percent of households in urban America had air conditioning. Today, it’s over 87 percent.

It’s almost impossible to imagine, dashing from the house A/C to the car A/C to the office A/C to the restaurant A/C, how hot and different the American summer once was.

One evocative recollection of the un-air-conditioned American city is Arthur Miller’s vignette ‘Before Air-Conditioning,’ which describes New York in the summer of 1927. The street in those days was repurposed nightly as an outdoor dormitory; mattress-laden fire escapes lined the block like iron bunk beds.

Lacking that option, there was always Central Park, where Miller would ‘walk among the hundreds of people, singles and families, who slept on the grass, next to their big alarm clocks, which set up a mild cacophony of the seconds passing, one clock’s ticks syncopating with another’s. Babies cried in the darkness, men’s deep voices murmured, and a woman let out an occasional high laugh beside the lake.’

That was the year Babe Ruth hit 60 home runs; then came air conditioning and the reinvention of American life.

The National Academy of Engineering ranked air conditioning the tenth-most important achievement of the 20th century.”