There are different types of fireplace inserts available for existing fireplaces. You can convert a wood burning fireplace to gas, by adding this type of insert and installing a gas line to the unit. Or if you prefer to burn wood, you can install a wood burning insert. Both types of inserts offer a solid sealed design to keep heat in and come with a blower to force the hot air into the room and provide heat. You can find inserts as well as a variety of fireplaces online at Copperfield Chimney Supply .