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Some of the reasons a chimney damper won't close properly include shoddy installation, age-related damage, or heavy snow or ice affecting a top-sealing type. Poor chimney maintenance and a buildup of rust, debris, or creosote can also cause dampers to jam. Annual inspections and chimney sweep costs are worth it to help you avoid a damper disaster. 

The cost to replace a chimney is about $10,000 on average and can cost up to $15,000, depending on the size, accessibility, materials, and extent of the replacement. Sometimes tearing the chimney down to the roof line and rebuilding it is an option. But if the chimney's internal structure deteriorates badly enough, a complete demolition down to the fireplace or the foundation may be necessary.

There are fire codes for a fireplace mantel made of wood or other combustible material. The mantel must be mounted at least six inches away from the fireplace opening on all sides with a non-combustible material—like stone or brick—installed between the mantel and fireplace. Building codes and regulations will vary based on your location, so before beginning the project, research the requirements in your area.

You should not use Windex or any other ammonia-based glass cleaners when cleaning the glass doors or glass front panel of a gas fireplace. Instead, remove the glass and lay it on a soft surface, like a drop cloth or towel. Then clean it using a specialty fireplace glass cleaner purchased at a hardware store or online. If the glass is relatively clean, you can get away with a vinegar and water solution, but tougher stains will require a specialized cleaner.