Nearly 40 percent of schools in the United States were built before the 1970s, when temperatures were cooler and fewer buildings needed air conditioning (AC).
That has changed. In recent decades, heat has crept northward, increasing the number of school days with temperatures above 80 degrees Fahrenheit.
Large parts of the country, where temperatures were previously cooler, now experience at least one month of school days with temperatures above 80 degrees Fahrenheit. Many schools in these places still don’t have air conditioning.
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