Air conditioning
Modern air conditioning emerged from advances in chemistry during the 19th century, and the first large-scale electrical air conditioning was invented and used in 1902 by US inventor Willis Carrier. The introduction of residential air conditioning in the 1920s helped enable the great migration to the Sun Belt in the United States.
Refrigerator car
Edwin Tobias Earl was born on a fruit ranch near Red Bluff, California on May 30, 1858. His father was Joseph Earl and his mother, Adelia Chaffee. His brother was Guy Chaffee Earl.
Career. He started his career in the shipping of fruits. By 1886, he was President of the Earl Fruit Company. In 1890, he invented the refrigerator car to transport fruits to the East Coast of the United States. He established the Continental Fruit Express and invested US$2,000,000 in refrigerator cars. In 1901, he sold his refrigerator cars to Armour and Company of Chicago and became a millionaire.