we went ventless in our fireplace and it works great, have a thermostat across the room just set it and forget it.the soot and fumes isn't near as bad as when burning wood. the vented logs are quit a bit more expensive to run, the air from the outside helps give the flames a more natural look, a fireplace shop told us that it would cost 3 to 5 dollars a day to opperate,,where as the ventless is 99% efficient and our furnance is 92% with the fireplace on the furnance hardly runs.