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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.

Running a gas fireplace is potentially cheaper than using central heating if you are heating a single room and don’t need to heat the entire house. That's because gas fireplaces are a better source of direct heat, making them more efficient for warming small spaces. Central heating, while more efficient for whole-home warmth, uses more energy overall. Strategically using a gas fireplace, therefore, can help lower heating bills.

A 40-pound bag of wood pellets can provide a solid 24 hours or so of burn time, though the exact length may vary. If you’re using your pellet stove as an exclusive heat source during the winter, you’ll need an estimated 100 to 150 of those 40-pound bags, depending on how hot you like to keep your home, its size, the climate, and other factors.

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.