Not only is going energy efficient affordable, but the financial and health benefits far outweigh the initial costs. We estimate that it costs from one to two percent more (excluding tax credits) upfront to build a home that uses up to 30-40% less energy than conventional construction. In fact, the typical payback period is less than four years. And not only will you enjoy the continued savings, but your home will be worth more. In addition, improving the tightness of your home and ventilating properly can result in a healthier environment for you and your family.