Woodburning fireplaces are inefficient and put out toxins into the air. Converting with a gas insert reduces heating costs as a good gas insert will heat rooms of between 1,000 square feet and 3,000 square feet. They are clean burning, great for the environment and your health. Your new gas insert will burn its fuel at over 70% fuel efficiency, compared to only 10-20% with wood. This could save you up to $400 per year on your heating bills.