1326947a_ur_home___GreenNav_s_Open_Blog__Simple_way_to_reduce
[0] Flue losses [Typical losses] 10% [Simple way to reduce] 
At times that the fireplace is not in use, block the chimney (make sure you put a note in the fireplace to unblock it when you light a fire again!)
Insulation in your home | GreenNav's Open Blog
Simple way to reduce