Do glass doors make the fireplace produce additional heat?
No. A glass door will keep the opposite side of the room warmer because the doors slow down the air being sent out the chimney. Glass door make the fireplace “feel” cooler right next to it because the glass blocks some of the radiant heat. A glass doors main “plus” is safety. You can leave the room or go to bed before the fire is completely out without the fear of a spark popping out into the room. So, only buy the door if safety is your main issue, not additional heat.
