Insulation was put above our gas fireplace. That should minimize heat creeping straight up, and instead focus the heat out into the family room.
Rutland 10 ft. x 1-1/2 in. Fiberglass Fireplace Insert Insulation 105 - The Home Depot
Choice of insulation behind electric fireplace
Fireplace Safety and Indoor Air Quality Tips
Gas Fireplaces 101 - All You Need to Know - Bob Vila
Skamolex panels - Heat Design™
Finally got around to insulating my fireplace
How to Install Gas Fireplace Insert
How to Repair Gas Fire Matrix?
The Napoleon Vector 38 Linear Gas Fireplace has 30,000 BTUs and is safe to display TVs and artwork above the fireplace. Free Shipping!
Napoleon Vector 38 Linear Direct Vent Gas Fireplace