Air conditioning, as an idea, has been around since the 1800s when an inventor named Michael Faraday learned that you could cool down the heated air around you if you condensed as well as liquefied certain in-air gases when you allowed the substances to evaporate into the air. It was a very complex idea with tons and tons of study and overall, the concept remained mostly speculative.Willis Haviland Carrier would invent the first air conditioner using concepts developed by Michael Faraday.