Fireplace Flue Damper Key I Need Help With Fireplace Insulation...?

I Need help with fireplace insulation...? - fireplace flue damper key

I would like to make a chandelier in my fireplace in winter (instead of a real fire) to. I Burn / gate closed, but I always get a bad project, which blows my sails and let the cold seep into my house. Has anyone a simple home remedy to temporarily isolate a home? Thank you.