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Not all gas fireplaces need a chimney. If you install a ventless gas fireplace, it will release low levels of combustion byproducts back into your living space (instead of pushing them outside through a chimney or vent). Ventless fireplaces burn fuel efficiently, so the emissions are minimal—but they could bother people with allergies or respiratory issues.

While you have some flexibility in the types of wood you can use in your outdoor furnace, it's important to make wise choices for optimal performance and efficiency. Hardwoods, such as oak, maple, and cherry, are generally recommended for their higher energy content and cleaner burn. These hardwoods produce more heat per volume and tend to produce fewer creosote deposits, which can accumulate and cause a chimney fire, according to the U.S. Environmental Protection Agency.

There are a few things you can look out for to ensure your chimney is safe to use. Check for the following issues:

• Cracks or missing pieces in the masonry of the chimney

• Creosote buildup in the chimney, which is a black, tar-like substance

• Cracks, stains, or scorch marks in the firebox

• Water stains in or around the fireplace

• A broken or stuck damper

Yes, removing a chimney is a difficult and major undertaking. Chimneys often provide structural support to a home, so if it's a load-bearing structure, you'll need to take extra precautions to maintain your home's integrity. A project of this complexity typically requires a structural engineer, a masonry contractor, and a demolition crew. The removal process may involve taking the chimney out brick by brick from inside the walls. The cost for chimney removal can range from $2,000 to $10,000, depending on the job's complexity. Due to the difficulty and cost, some homeowners opt to remove the fireplace and seal the chimney at the top and bottom, sometimes also removing the visible exterior portion at the roofline.