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While you have some flexibility in the types of wood you can use in your outdoor furnace, it's important to make wise choices for optimal performance and efficiency. Hardwoods, such as oak, maple, and cherry, are generally recommended for their higher energy content and cleaner burn. These hardwoods produce more heat per volume and tend to produce fewer creosote deposits, which can accumulate and cause a chimney fire, according to the U.S. Environmental Protection Agency.

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.

Backdraft is usually caused by a ventilation or pressure problem. To stop it, you need to replace the air your fireplace draws out through the chimney, so open a window to try and increase the airflow. Sometimes turning on a kitchen or bathroom exhaust fan can help, but they could also be the cause of the backdraft depending on the air pressure inside your home. You may need to install a makeup air system (MUAS) or chimney fan.

In most homes, your chimney and HVAC are separate from each other. However, you can use your chimney to save on heating costs in the winter. Turn off your HVAC system and start a cozy fire, then watch the electric bills drop during the coldest months. Make sure your flue is closed when not in use so that you don’t end up pumping heat or cool air from your system outside.