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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 chimney cap costs about $300 on average to install, with prices ranging from $75 to $1,000. The final cost depends on several factors, including the professional you hire, the accessibility of your chimney, the cap's material and size, whether any repairs are needed, and if it requires custom fabrication. Chimney caps are usually made from galvanized steel, stainless steel, or copper. Copper caps are the most expensive, followed by stainless steel and then galvanized steel. Excluding labor, average material costs are around $100 for galvanized steel, $250 for stainless steel, and $600 for copper. You may also face additional costs, such as hiring a chimney sweep to clean the chimney before the cap is installed.

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.

You should schedule a fireplace inspection at least once a year, per the National Fire Protection Association (NFPA). However, this is the minimum requirement even if you’re diligent with fireplace maintenance between uses. If you suspect your fireplace is malfunctioning, schedule one sooner to avoid fire hazards or the release of harmful emissions like carbon monoxide in your home.