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You can close up a chimney instead of demolishing it. Homeowners often go this route because the cost of removing a chimney, especially a structurally important chimney, can be expensive.

Properly closing up a chimney involves closing and sealing the damper, installing a chimney cap damper, and sealing the fireplace opening with a door or bricks. The cost to seal and cap a chimney is around $500 to $650—significantly less than the average chimney removal cost.

Yes, if your gas fireplace has a flue, you typically need to open it when using the fireplace. Although gas fireplaces don’t produce the type of smoke and soot that wood-burning ones do, they still release combustion gasses like carbon monoxide. Opening the flue ensures these gasses safely exit your home through the chimney. Not all gas fireplaces need a chimney, however. Always check the manufacturer’s instructions for your specific gas fireplace model, as some newer models may have different ventilation requirements.

You can research your fireplace insert or retrofit by checking out the EPA wood stove database. The database includes information, such as a model's emission rate, efficiency, and carbon dioxide output.

Neglecting to clean your chimney can lead to serious safety hazards. A primary risk is the buildup of creosote, a highly flammable substance that can ignite and cause a dangerous chimney fire. This buildup can also create blockages in the flue, resulting in poor venting of smoke, soot, and toxic gases like carbon monoxide, which can then enter your home and create dangerously poor indoor air quality. Additionally, creosote is acidic and can damage the chimney's mortar and metal components over time, potentially allowing smoke to leak into your house. To prevent these issues, it is essential to schedule an annual chimney cleaning with a professional.