Adding a chimney pillow can help you stay warm. When winter winds blow when a fireplace is not being used, much expensive heated room air often escapes through a leaky chimney damper.
That’s now easily corrected by adding an inexpensive chimney pillow — like a beach ball or mini air mattress of sorts. You put it in the chimney just above the damper and inflate it with a hand pump or by mouth until it expands and seals off the flue. Then just close the tap on the fill hose and it blocks heat in and freezing cold out. It also keeps out soot, birds, noise and debris until you open the valve and deflate it.