When did Air Conditioners become popular in the US

by yugiohpuzzle13

I was watching an episode of Mad Men and in the first season somebody comes by trying to sell the Draper Family an air conditioner. They were pretty well off so that got me thinking. When did most homes start owning an air conditioner?

Georgy_K_Zhukov

More of course can be said, but this thread touches on the topic so would be of interest.