Under the American Recovery and Reinvestment Act of 2009, the federal budget for its Weatherization Assistance Program jumped from $250 million per year to $5 billion. But how much energy will retrofitted weatherization really save among households eligible for such support? Researchers Catherine Wolfram and Meredith Fowlie want to know. They have designed large-scale randomized-control field trials to study if and when consumers take advantage of the newly available federal funds to support weatherization. The U.S. Department of Energy is interested in supporting research on its Weatherization Assistance Program, but cannot provide funding in a timely manner. Sloan funding will allow the project to move ahead now rather than waiting another year or more for the U.S. Department of Energy to provide support.