It has gone from luxury to necessity, and there are over 2 billion air conditioning units in the world today.

In this episode, we'll take a look at how air conditioning got started, why people didn't mind being hot in the past, and what the true cost of staying cool might be for future generations.

• Staying cool is nothing new: Romans & Egyptian methods
• Ding Huan & the rotating fan
• Why people were afraid of creating cold artificially
• How the Dutch magician Cornelis Drebbel tricked King James I in 1620
• Benjamin Franklin getting sweaty one July in Philadelphia
• Primitive air conditioning by pumping air over ice
• Did people actually mind that there was no air conditioning?
• Willis H. Carrier & the first air conditioning unit
• Convincing the US public that it was something they needed
• 1920s sweaty American cinemas
• Spending $600,000 on an air conditioning unit in 1932
• The boom of air conditioning in the US
• How many households around the world have air conditioning in 2021?
• The impact of air conditioning: the good, the bad & the unexpected
• Environmental impact of air conditioning
• Future of air conditioning in the developing world
• New air conditioning technologies: high & low tech 

Full interactive transcript, subtitles and key vocabulary available on the website: https://www.leonardoenglish.com/podcasts/air-conditioning

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