U.S. flag

An official website of the United States government

Department of Labor Logo United States Department of Labor
Dot gov

The .gov means it's official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you're on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

December 1984

Productivity in making air conditioners, refrigeration equipment, and furnaces

Horst Brand, Clyde Huffstutler

Output per hour rose rapidly during 1967-73, reflecting brisk demand; output tended to stagnate after 1973, but was shored up by orders for energy-efficient equipment and by export sales.

Download PDF »