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You should never block both the top and bottom of your chimney. Proper airflow is essential because the temperature inside the chimney will still fluctuate as your house warms and cools. Moisture can build up without ventilation, leading to dampness in your walls over time. Blocking the top prevents debris and animals from entering, but the chimney still needs air circulation to avoid condensation issues. Allowing the chimney to breathe maintains the health of your home and prevents long-term damage.

You can build a fireplace on an existing house, but it’s much easier to construct a masonry fireplace when building a new house. To add to an existing house, you’ll need to build a chimney and ensure the foundation can support a true masonry fireplace. Alternatively, you can purchase a gas or electric fireplace insert, which isn’t as complicated to add to an existing structure.

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.

Although they provide heat, light, and atmosphere, pellet stoves require electricity to run certain parts, which some homeowners may find to be an unfortunate additional expense. They can also produce noises that some may find annoying, like a low rumble from the blower fan or its motor.