In this course, participants will see how retrofitting existing buildings using the Passive House Institute EnerPHit standards breathes sustainable life into old buildings. You will learn about the EnerPHit standards and process and look at the Passive House standard from the perspective of retrofitting existing structures. We will review case studies of past retrofits, focusing on their airtightness, insulation, thermal bridge reductions, high-performance windows, and ventilation. This specialized course intended for building industry professionals is an introduction to Passive House retrofits and is part one of a retrofit series coming soon. The course can be held virtually or in-person and is a combination of presentation and discussion.