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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.

A quality pellet stove that receives proper maintenance should last you about 15 to 20 years. However, how long a pellet stove lasts depends on how well you care for it over the years and how often you call on it for heat. Proper maintenance—including cleaning the vents periodically, vacuuming the ash pan when it gets full, and refreshing the pellets when needed—can help your pellet stove last longer.

Yes, gas fireplaces benefit from chimney caps just like wood-burning fireplaces. While gas fireplaces produce fewer byproducts, a chimney cap still helps prevent rain, debris, and pesky critters from entering the chimney, which can cause blockages or damage. It also prevents downdrafts that could push harmful gases like carbon monoxide back into your home. Even with the cleaner operation of gas fireplaces, a chimney cap adds a layer of protection and helps maintain proper ventilation.

No, there are no ventless pellet stoves. Because pellet stoves burn wood pellets, they produce wood smoke—which contains carbon monoxide. This harmful substance needs to be vented out of your living area. That said, there are vent-free and ventless fireplaces that run on natural gas and propane. These offer the heating and ambiance of a fireplace without the need to vent thick and hazardous wood smoke.