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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. 

For many people, the primary disadvantage of a gas fireplace insert is that it doesn’t look or smell like a classic wood-burning fire. Additionally, the labor costs of installing a gas insert are higher than some other types of fireplace inserts, including electric and pellet inserts. There are also limitations on where you can install ventless gas fireplaces because they’re banned in certain places (including California).

Chimney liners often benefit from insulation, though it is not always required. Insulation helps improve the liner's efficiency by keeping flue gasses hotter, which enhances draft and reduces creosote buildup. It also prevents condensation, which can lead to corrosion. Insulation is important for chimneys on exterior walls or in colder climates. Some building codes may require insulation, so checking local regulations is essential.

You don’t need electricity for a wood-burning stove unless it has a blower fan. Some wood-burning stoves include blower fans to help with heat distribution, but blower fans have a motor and use electricity to power the fan. You can still operate a wood stove without using the blower fan, so it’s a good source of heat if you have a power outage or are looking to lower your electric bill during winter.