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There are several ways to determine if your chimney or fireplace damper is open or closed. A simple method is to check for airflow by placing your hand near the fireplace opening; if you feel a draft or hear wind whistling, the damper is open. An open damper might also make the room feel cooler, similar to the outdoor temperature, or cause your HVAC system to work harder than usual. For a more definitive test, you can try a visual inspection, although it may be difficult to see. Alternatively, you can light a small piece of paper and observe the smoke; if it is drawn up the chimney, the damper is open. Always use the damper handle to adjust its position.

Your state, city, or even homeowners insurance company may have requirements on how far the outdoor wood furnace should be from the house, so be sure to abide by those regulations. In general, you should install an outdoor wood furnace or boiler as few as 30 feet or as much as 500 feet from the house or any other building.

Running a gas fireplace costs approximately $0.35 per hour for natural gas and $0.62 per hour for propane, though these figures can vary significantly based on fuel prices in your area. On average, the annual cost to run a gas fireplace is between $400 and $640. The exact impact on your utility bill depends on several factors, including how often you use it, the size of the room you're heating, and the fireplace's BTU rating. Some models with a constantly running pilot light will consume a minimal amount of energy even when off, although many modern fireplaces do not require one. If you are looking for a more energy-efficient option, consider an electric fireplace.

No, not all chimneys need a damper. However, most chimneys do, especially in newer homes. Most gas-burning fireplaces cannot function safely without a damper. Only some older wood-burning fireplaces can function safely without one. A chimney without a damper is essentially just an open hole in the roof of your home.