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night and releases it in the day. The air conditioner employs eutectic salt hydrates that freeze at 55 degrees. They are frozen at night when power demand is low, then used for cooling in the day, reducing electrical drain at critical periods during heat waves. The prototype under development at the University of Pennsylvania is designed for the fastgrowing home market. More than 6.5 million dwellings in the United States have central cooling systems; they are being sold at a rate of more than a million a year.
From 75 to 80 percent of all office buildings have central or room installations. This has settled the old argument about where the electric fan should go, but has created a new one.
Women generally like warmer temperatures than men. A Tucson law firm solved the problem by creating “filly stalls,” an office area for women that is kept 4 to 6 degrees warmer than the men’s quarters.
Air conditioning isn’t for people only. An Illinois watch company installed an elaborate atmosphere-control system to keep rust and dust from gumming up the delicate works of its time pieces.
Air conditioning also keeps tumps out of sugar in refineries, protects telephone cables from excessive humidity, and prevents temperature changes from expanding or contracting precision parts.
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