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Air conditioning has been around since 1902, but due to the cost and the size of the units, very few people could afford or accommodate these units. So the humble fan was still in use for many and remained that way for the next 70 years. Even by 1960, only 10% of American homes had air conditioning installed, but it wouldn't take long until the technology caught up with demand. For a better understanding of air conditioners and how they work, please read this article.