The Heat Relief Network is a regional partnership of the Maricopa Association of Governments (MAG), municipalities, nonprofit organizations, the faith-based community, and businesses. Each year, MAG coordinates the mapping of the Heat Relief Network, a network of partners providing water, cooling, and donation sites throughout the Valley with the goal of preventing heat-related illnesses and deaths among vulnerable populations. The map and directories are updated as new partners sign up throughout the summer season, which runs May 1 to September 30.