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.
Povl Ole Fanger
Povl Ole Fanger (July 16, 1934 – September 20, 2006) was an expert in the field of thermal comfort and perception of indoor environments. He was a senior professor at the International Centre for Indoor Environment and Energy at the Technical University of Denmark. He was a visiting University Professor at Syracuse University when he died at the age of 72 from an abdominal aortic aneurysm. His work is credited with demonstrating that poor air quality in homes can cause asthma in children, and that poor air quality in workplaces decreases productivity. His contribution to the research on thermal comfort still defines the state of the art in HVAC technology and the basis for international standardisation. He is also known for creating indoor air quality (IAQ) units of measurement known as the olf and decipol.