9. Willis CarrierAnother inventor, Carrier invented something that is used every day in most countries - air conditioning. An engineer, Carter invented the first modern air conditioning system that included the four crucial controls all air conditioning systems must have:
1. control temperature; 2. control humidity; 3. control air circulation and ventilation; 4. cleanse the air.
Without these 4 elements, air conditioning was downright dangerous to use over time. In 1911, Carrier presented his initial schematics, what became known as the 'Magna Carta of Psychometrics', making it possible, for the first time ever, to design air conditioning systems that fit whatever requirements needed. There is no doubt that this invention not only increased quality of life around the world, but also saved many from dangerous temperatures.