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 a few things you can keep an eye out for that indicate you may need to call in a gas fireplace repair tech:

• Your fireplace pilot light won’t stay on.

• You notice the smell of rotten eggs.

• You hear hissing coming from the gas fireplace.

• You notice a soot build-up.

• The fire goes out unexpectedly.

If you notice a rotten egg smell or hear hissing, you could have a gas leak, which is extremely dangerous. Call the fire department and your gas company first to shut off the gas and air out your home before calling for a repair.

Ideally, your chimney cap should be at least 8 inches above the top of the flue, though it's better if it's even higher. You want it to sit that high because it won't affect the chimney's draft, which pulls the smoke up and out of your chimney and away from your home.

Well-seasoned hardwoods like oak, maple, hickory, and ash are the cleanest woods to burn in a fireplace. When properly dried, these woods have low moisture content, allowing them to burn hotter and produce less smoke, which minimizes creosote buildup. Ensure the wood is seasoned for at least six months for optimal burning.