Posted 1/10/2018 17:34 (#6494649 - in reply to #6488413) Subject: RE: Fireplace not efficient
One factor that no one else mentioned is the location of the thermostat for your regular furnace. If it's in the same room, then the heat from the fireplace 'tells' the other heating system that everything's fine and it shuts down. Living room is warm as toast, but rest of house a refrigerator.