have exceeded 110 degrees particularly in phoenix, and the record heat wave is showing no signs of breaking. the heat has been unrelenting in our community. we have to be innovative, and ha is the phoenix way. we build for extreme temperatures in the summer so that we ve made infrastructure investments that help us get out of these challenges. but this summer has set some tough records. from the southwest to florida, 44 million people are under heat warnings today. the heat not just taking a toll on millions of americans, it also drives up costs for businesses trying to find ways to keep employees and customers cool. a recent report says extreme heat costs the u.s. $100 million each year in lost productivity. those high temperatures are on the move. cnn meteorologist chad myers joins us right now. chad, more records could be set