For a growing number of schools in the Clark County (Nev.) district, air conditioning units have reached the end of their 20-year lifespan, The Las Vegas Sun reports. Already this year, classes at Durango and Valley high schools have been canceled for cooling problems. Smaller cooling outages occur nearly every day in district schools. Teachers have moved students into other classrooms, libraries and computer labs. At some elementary schools, they dole out Popsicles to children in hot classrooms. The problem is only getting worse. During the recession, the district slashed its maintenance budget, cutting more than 50 technicians and deferring repairs to stave off classroom reductions.