In the United States today, nearly 28 percent of families live on incomes less than 200 percent of the federal poverty line. And although they may be the least able to bear it, low-income families face disproportionately higher energy burdens than wealthier households. They spend a far larger percentage of their total household income on paying utility bills than the average U.S. household. In fact, a recent report found that, for families living in large cities, the median low-income household’s energy burden was more than three times as high as that of non-low-income households. This provides the context for why improving the efficiency for low-income households is so important.