The U.S. Department of Energy's (DOE) Low-Income Weatherization Assistance Program (WAP) has been active since 1976. Approximately 100,000 homes a year received weatherization assistance through this program from 2002-2007. The American Recovery and Reinvestment Act provided funding to weatherize 600,000 homes. To date, more than 6 million homes have been weatherized under this program. The structure of weatherization delivery is as follows. U.S. DOE provides funds to grantees, usually states. These grantees then provide funds to local agencies. These agencies do the assessments and final inspections of the homes. Some agencies have their own crews to install weatherization measures, while others contract out to private contractors. The focus of these efforts is the client, usually a homeowner, but in some cases a renter, who must meet eligibility requirements.