What do you do with a drafty attic? A window? The whole house? Ed Minch and Thom Marston are here with us today to talk about one approach to making homes more energy efficient and their work at the nation's first energy audit company, Energy Services Group. Stick around and learn about Ed's "p.h.d." approach, what Thom thinks you should do about that old attic, and what retrofitting can mean in terms of historic preservation. This is PreserveCast.