Energy Efficiency, Simplified. Our aim is to make it simple for you to have a greener home, and save some green too. We figure, the easier we make it for homeowners to be more energy efficient, the more they will – and that’s good for all of us. For the past seven years, Massachusetts has ranked #1 in energy efficiency out of all 50 states. As a Mass Save® partner and largest Home Performance Contractor in Massachusetts, we’re proud to be leading the U.S. in energy efficiency while reducing our customer’s energy costs and carbon footprint.