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1. Willis Carrier invented air conditioning in 1902 to control temperature and humidity levels for a printing plant, allowing colors to be consistently aligned. 2. Early home air conditioners were too large and expensive, but spread to department stores and theaters in the 1920s-1930s as costs lowered. 3. Employers initially saw air conditioning as a luxury and thought it would reduce productivity, but research in the 1940s-1950s found it increased output in offices by up to 24% by making workers more c

Author

buitinh

Language

EN