 It is hot in the U.S. right now. Temperatures are projected to reach about 120 degrees in California and in Nevada. So this 4th of July, Americans are looking to cool down. And while some are taking to swimming pools, others are using window air conditioning units to beat the heat. Over 7 million AC units are sold every year, according to the U.S. Department of Energy. But what happens if you can't use your AC during this unprecedented heat wave?