On a Sunday morning earlier this month, Andrew Joo and his girlfriend, Erika Lippert, woke up and noticed that their Lafayette Square home was much hotter than usual. With the city in the throes of a serious heat wave, they gave it little thought, turned down the thermostat and left. Upon returning that afternoon, the heat was so intense that they immediately called an air-conditioning repairman, who told them to check... More >>>