Gas fireplaces, including inserts ... and less energy-efficient since heat escapes up the chimney. Unvented or vent-free systems are usually less expensive, but they aren’t designed to provide ...

Debate over gas stove health risks continues as studies link emissions to asthma. Proper ventilation can reduce exposure, GAO ...

Gas fireplaces, including inserts ... and less energy-efficient since heat escapes up the chimney. Unvented or vent-free systems are usually less expensive, but they aren’t designed to provide ...