How HVAC&R Changed the World

The HVAC&R industry has changed our lifestyles so thoroughly that we take many engineering innovations for granted. Although they have been continuous throughout our industry's history, some developments in the 20th century broadly and directly affect our lives today. This article explores how these innovations developed in relation to one another. Much of the information presented here was published previously in expanded form by the author, and readers who wish to explore the topics more deeply are encouraged to consult the references cited.