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In short, yes, gas fireplaces create fewer pollutants and are considered more environmentally friendly than traditional ones. In general, natural gas fireplaces release only half to two-thirds as much CO2 per unit of heat (BTU) as burning wood. Plus, gas fireplaces emit fewer harmful particles and air pollutants. They can also be about three times as efficient as wood in terms of heating your home, resulting in a much higher level of their energy converting into heat.

Both vented and ventless gas fireplaces have pros and cons, and the best choice depends on your needs and preferences. A ventless fireplace may be a good option if you do not have a chimney, but you should check local regulations as they are banned in some areas, such as California. On the other hand, if anyone in your household has allergies, asthma, or other respiratory sensitivities, a vented fireplace is a better choice for health and air quality.

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.