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Yes, capped chimneys should still be vented. Failing to vent a chimney will result in condensation buildup inside the chimney, which commonly results in mold growth. If mold begins to grow in a chimney, it frequently goes undetected and spreads quickly through the home. Mold and moisture can damage the structural integrity of your home, and exposure to mold can cause discomfort and illness in residents.

Wood is classified as either hardwood or softwood. For firewood, hardwoods are generally the best choice as they tend to burn longer, hotter, and produce less smoke than softwoods. Recommended hardwoods include oak, hickory, maple, cherry, ash, beech, birch, elm, and walnut. Oak is a particularly good option as it's widely available, slow-burning, and doesn't produce much smoke or sparks. Some woods, like oak, hickory, and cherry, also emit a pleasant scent. It is best to avoid softwoods such as eucalyptus, poplar, and willow, as they create a lot of smoke and have a high moisture content that makes them difficult to light and burn efficiently.

The time it takes for creosote to build up in a chimney can vary depending on how often you use your fireplace and the wood you burn. Creosote can start accumulating after just a few fires, especially if you burn unseasoned wood or allow fires to smolder. Regularly using the fireplace without proper maintenance can lead to significant creosote buildup within a few months. To prevent hazardous buildup, have your chimney inspected and cleaned at least once a year.

The primary disadvantage of a ventless fireplace is that it doesn’t have an exterior venting system. This means that the byproducts from combustion are emitted into your home, which raises some safety concerns. In addition, ventless gas fireplaces produce moisture as they burn—and if there’s no ventilation, you could end up with a mold problem.