The Air-Conditioning Heating and Refrigeration Institute, in collaboration with the Association of Home Appliance Manufacturers, the Edison Electric Institute, the U.S. Energy Association and North American Technician Excellence, has launched the 2 Degree Pledge initiative to help homeowners achieve lower energy bills through greater energy efficiency. Consumers can sign up The Web site includes tools and calculators to help homeowners determine if an upgrade to a more efficient heating or cooling system makes sense for them.