In 2008, The McDonnell’s were in the beginning stages of planning their forever home in historic Franklin, just south of Nashville TN. They were looking to incorporate green high-performance elements into the construction to make an energy efficient, healthy, and sustainable structure. The couple and their builder reached out to E3 INNOVATE to learn about the benefits of spray-foam insulation, sealed crawlspace systems, geothermal heating and cooling, whole-house ventilation using energy recovery ventilators (ERVs), and active radon mitigation systems.