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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.

When your fireplace is not in use for longer periods of time, such as over the summer, you can keep smells at bay by spraying either a commercial fireplace deodorizing product or a blend of one part distilled white vinegar to one part water around the walls of the fireplace. 

Or, you can place a container of charcoal inside the fireplace to absorb odors. Just be sure to remove it before it’s time to start using the fireplace again.

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.

A fireplace's lifespan varies significantly depending on its type, the quality of construction, the materials used, and how well it is maintained. On average, you can expect a fireplace to last between 10 and 30 years, with many homeowners experiencing major issues after about 20 years.

Here's a breakdown by type:

• Gas Inserts: Typically last 10 to 25 years with proper maintenance.

• Electric Fireplaces: Have a lifespan of up to 20 years.

• Traditional Brick Fireplaces: Can last for centuries, but require ongoing maintenance and repairs, such as tuckpointing.