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Creosote logs can help to reduce new creosote build-up by about 60%, however they don’t replace regular cleaning. While creosote logs can help to prevent build-up of creosote in your chimney, they won’t remove build-up that’s already there. Creosote logs can be used as a preventative measure in conjunction with regular cleaning, but you will still need to clean your chimney about once per year.

Backdraft is usually caused by a ventilation or pressure problem. To stop it, you need to replace the air your fireplace draws out through the chimney, so open a window to try and increase the airflow. Sometimes turning on a kitchen or bathroom exhaust fan can help, but they could also be the cause of the backdraft depending on the air pressure inside your home. You may need to install a makeup air system (MUAS) or chimney fan.

Your chimney comes with dampers, which are similar to air vents. Dampers are metal plates that allow hot air and smoke to flow from the fireplace up your chimney and out of your home. When you close the damper, it prevents cool air from getting into your home. This is why you’ll want to check to make sure your damper is open before starting your fireplace and you want to ensure it’s closed after the fire goes out. You can open and close them via an external knob, pull chain, or lever. 

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.