Hidden compartments in houses take all shapes and forms: electrical outlets, hollow books, fake CDs, false cabinet fronts. But what about the heating system? Any dope dealer or jewel thief will tell you that it’s easy enough to unscrew the heating register (grille) and stow drugs or diamonds in the metal ductwork. You can improve… Continue reading Hiding Space in HVAC Vent? Interesting But Still a Dumb Idea.