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A gas fireplace insert costs about $3,600 to install, on average. The cost to install a gas log insert ranges from about $700 to $6,500, depending on the size, type of insert, how it works, and heating needs. Gas fireplaces need electrical and gas lines installed properly, so hiring a pro is recommended rather than trying to DIY installation.

The answer can vary widely based on a home's age and design. As with any type of remodeling project, assume that every structure is load-bearing until confirming otherwise with a structural engineer. Almost all modern homes have chimneys that are fully independent from the rest of the home's framing. As a result, they don't bear any load beyond their own weight. However, many historic homes built prior to the 1900s contain load-bearing chimneys that tie into the surrounding roof and floor joists. If possible, use a home's blueprints or look for chimney connections that indicate load-bearing qualities to get your answer.

Bioethanol fireplaces are safe when users follow the instructions and maintain the fireplace. Ethanol is flammable, however, and should be kept away from flammable surfaces, children, and pets.

One disadvantage of a wood furnace is that you need a constant supply of wood to run it. Even if you have a good amount of wood on your property (or have another way to get affordable wood), you’ll still need to chop it, store it, and re-fuel your furnace with it to keep your house heated.