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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.

Your chimney comes with dampers, which are similar to air vents. Dampers are metal plates that allow hot air and smoke to flow from the fireplace up your chimney and out of your home. When you close the damper, it prevents cool air from getting into your home. This is why you’ll want to check to make sure your damper is open before starting your fireplace and you want to ensure it’s closed after the fire goes out. You can open and close them via an external knob, pull chain, or lever. 

A fireplace hearth is necessary in most areas per building codes, especially for gas and wood-burning fireplaces. Electric fireplaces may not require a hearth, so check local building codes or ask a pro for guidance if you’re leaning toward electric. A fireplace hearth can decrease the risk of flying embers creating a fire and burning your home down. That’s why fireproof material, like tile, is used for the hearth.

In homes that have a gas furnace, it's typically the heating system that uses the most gas. That explains why your gas bill is almost always higher in the winter and other colder months than it is in the summer. Other appliances that may use gas include your water heater, clothes dryer, and stove.