refrigeration and refrigerating machinery

"Keeping things not too hot and not too cold--that's the tricky task of HVAC techs! Discover how these trained professionals help keep homes cool in summer and cozy in winter, food fresh, and the planet from getting too warm. Learn how you can pursue a career in this in-demand field!"--.

Describes the history, inventors, and science behind the important invention of refrigeration and refrigerators.

Presents the history of refrigeration and how humans have battled to keep things cold from the ice houses of ancient Persia to the present day, and discusses the impact of refrigeration on society and science.

Discusses how refrigeration and air conditioning work.

Traces the history of our attempts to keep things cool, from the early use of fans and ice to modern refrigeration and air conditioning.