Willis Haviland Carrier
November 26, 1876 – October 7, 1950
Willis Haviland Carrier was an American engineer, best known for inventing modern air conditioning.
Carrier invented the first electrical air conditioning unit in 1902, in response to an air quality problem experienced at a Brooklyn publishing company. Carrier submitted drawings for what became recognised as the world's first modern air conditioning system.
In January 1906, Carrier was granted US patent 808897 for an apparatus for treating air – the world's first spray-type air conditioning equipment.
In 1911, he was credited with presenting “perhaps the most significant document ever prepared on air conditioning”, or the “Magna Carta of Psychrometrics”, at ASHRAE’s annual meeting. The paper, Rational Psychrometric Formulae, brought together concepts of relative humidity, absolute humidity and dew-point temperature – allowing air conditioning systems to be designed to fit on-hand requirements.