The findings showed that during the heat wave, students in the buildings without AC performed worse on the tests than students in the air-conditioned dormitories and experienced decreases across five measures of cognitive function, including reaction times and working memory. During the heat wave, students in buildings without AC experienced 13.4% longer reaction times on color-word tests, and 13.3% lower addition/subtraction test scores compared with students with air-conditioned rooms. Combined, these data show that students in rooms with AC were not just faster in their responses, but also more accurate.