Air-conditioning was invented by Willis Carrier to help a Brooklyn, New York, printer get decent color during hot, humid weather. Air-conditioning wasn’t used for cooling people until 1924, when it made its debut at the J. L. Hudson Department Store in Detroit, Michigan. (This is another one of my useless facts.) I am so thankful for air conditioners! I grew up without air conditioning here in Phoenix. I don't remember it being all that bad as a child. But as an adult if the A.C. goes out I get in a BAD mood! And that's interesting that Carrier invented A.C., our other house has had the same Carrier unit on it for 24 years. It's a good one!