To earn the ENERGY STAR, a home must meet guidelines for energy efficiency set by the U.S. Environmental Protection Agency. These homes are at least 15% more energy efficient than homes built to the 2009 International Energy Conservation Code (IECC) and include additional energy-saving features that typically make them 20-30% more efficient than standard homes. ENERGY STAR certified homes save you money, improve the quality and comfort of your home, and protect the environment.