According to the U.S. Department of Energy, about 14% of total air infiltration in a home enters through a fireplace chimney-- even if the damper is pulled shut-- which can make your home less energy ...

draft stoppers and the trademarked Chimney Balloon) are an inexpensive way to choke off drafts when a fireplace is not in use. Made of inflatable urethane or cut-to-size foam, they fit snugly up ...