Air conditioning boosts man's efficiency no less than his comfort.
Air-conditioned homes, offices, and factories unmistakably raise
human productivity and reduce absenteeism, turnover, mistakes,
accidents and grievances, especially in summer. Accordingly, many
employers every year cool workrooms and offices to raise summer
profits. Employees in turn find cool homes enhancing not only
comfort and prestige but also personal efficiency and income. With
such economic impetus, low-cost summer cooling must irresistibly
spread to all kinds of occupied buildings. Refrigeration provides
our best cooling, serving well where people are closely spaced in
well-constructed, shaded, and insulated structures. However, its
first and operating costs bar it from our hottest commercial,
industrial, and residential buildings. Fortunately, evaporative
cooling is an economical substitute in many regions. First used in
Southwest homes and businesses and in textile mills, it soon
invaded other fields and climates. In 1946, six firms produced
200,000 evaporative coolers; in 1958, 25 firms produced 1,250,000,
despite the phenomenal sale of refrigerating window air
conditioners. Though clearly secondary to refrigeration,
evaporative cooling is 60 to 80 percent is economical for moderate
income groups and cheaper to buy and operate. Thus, it climates
where summers are short. Moreover, it cheaply cools hot, thinly
constructed mills, factories, workshops, foundries, powerhouses,
farm buildings, canneries, etc., where refrigerated cooling is
prohibitively expensive.
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