In this bonus episode of the Passive House Podcast, co-host Ilka Cassidy is at the Sustainability Symposium hosted by Green Building United. Ilka talks with Paul Thompson of BluPath, Lauren Thomsen & Matt Gindlesparger of Lauren Thomsen Design, Justin Iovenitti & Norm Horn of New Ecology and David Gavin of Quinn Evans. Ilka talked to the presenters of a row house renovation in Baltimore and a new construction row house in Philadelphia.