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Signs that your chimney may need to be replaced include visible damage like cracks in the structure, bricks, or mortar, as well as crumbling or flaking mortar and loose bricks. Leaks, dampness, discoloration, and efflorescence (a white, stain-like substance on the bricks) are also key indicators of water damage, which can compromise the chimney's safety. Addressing these problems is essential, as a chimney in this condition may be at risk of collapsing and causing major damage to your home. A full replacement costs about $10,000 on average, but can range from $3,100 to $15,400.

You’ll need vented logs if you have a vented gas fireplace and vent-free logs if you have a ventless gas fireplace. If you aren’t sure which type of fireplace you have, contact a local gas fireplace service. They’ll help identify your fireplace and explain which type of logs you need to run it.

The National Fire Protection Association (NFPA) says that chimneys and their associated elements like fireplaces, vents, or stoves should be cleaned at least once a year before the start of seasonal use. According to the Chimney Safety Institute of America, a chimney should be cleaned when there is 1/8 inch of soot buildup. If there’s more than that, creosote—a flammable byproduct of burning wood—can form and increase the risk of a chimney fire.

Installing a fireplace insert can get you more heat without replacing the whole fireplace and chimney. Other benefits include their convenience (you can turn them on and off with a simple flip of a switch), safety (most models have built-in sensors that will turn off the fireplace if they detect carbon monoxide), a modern aesthetic, and superior energy efficiency.