Reduce Heat Loss from the Fireplace

  • Keep your fireplace damper closed unless a fire is burning. Keeping the damper open is like keeping a window wide open during the winter; it allows warm air to go right up the chimney.
  • When you use the fireplace, reduce heat loss by opening dampers in the bottom of the firebox (if provided) or open the nearest window slightly--approximately 1 inch--and close doors leading into the room. Lower the thermostat setting to between 50° and 55°F.
  • If you never use your fireplace, plug and seal the chimney flue.
  • If you do use the fireplace, install tempered glass doors and a heat-air exchange system that blows warmed air back into the room.
  • Check the seal on the fireplace flue damper and make it as snug as possible.
  • Purchase grates made of C-shaped metal tubes to draw cool room air into the fireplace and circulate warm air back into the room.
  • Add caulking around the fireplace hearth.
    Find out more techniques to improve your fireplace or wood-burning appliance's efficiency.
    Learn tips for safe and efficient fireplace installation and wood burning.

Referrenced from Energy.com 

New York Energy Audit