Printing problem led to first air conditioner

le trying to figure out a way to solve a printing company’s humidity problem, this young engineer invented mechanical air-conditioning. The Sackett-Wilhelms Lithographing and Publishing Company of Brooklyn were having difficulty with its printing jobs during the summer. The paper it used absorbed moisture from the air and expanded, so colors printed on humid days didn’t line up with those printed on drier days. The result was blurry images. Carrier, then 25, theorized he could control the troublesome moisture in the printing plant by chilling the air. He designed a machine that blew air over