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Yes, you can close off a fireplace both temporarily and permanently with extremely wide price ranges. Temporary solutions involve fireplace plugs that can be inflated to block air and deflated to open the fireplace, covers, and boards. Permanent methods of shutting off fireplaces usually involve bricking up the fireplace or covering it with drywall. No matter the method, it’s probably best to hire a professional.

You can burn wood with oak wilt, as heat from the fire destroys the fungus, and smoke won’t threaten healthy trees. However, wood of unknown origin should be burned during the dormant season—do not store wood in the warmer months for the winter season. If you harvest oak, let it dry in the sun before transporting it elsewhere.

Depending on the model of your fireplace, you can leave your pilot light on year-round. This does use a small amount of fuel, so you’ll save on your energy bill by turning off the pilot light seasonally. Keep in mind that some gas fireplace models don’t have a standing pilot light.

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.