Many cities in New England and beyond have carbon neutrality goals and are actively addressing new construction to hit the goals. What about all the existing buildings? How will those be addressed to reduce energy and carbon? What creative enclosure approaches can be used to achieve these goals? Preservation of Affordable Housing has new construction projects in design to PHIUS standard. POAH also has rehab projects that never hit a passive house standard but go as deep as possible. Through review of existing projects and building data, this session will explore what we have done, what we learned from this, and make recommendations for other developers and designers.