Please choose the correct ending to complete the given sentence: Computers and Electronics: [header] How to make a fireplace more energy efficient [title] Install a top-sealing chimney damper. [step] Top-sealing dampers replace the fireplace throat damper and are installed at the top of the chimney. The top-sealing damper has a seal that acts like a storm door, keeping the expensive conditioned air inside the house and the outside air-outside.

Ending1: [substeps] Check the quality of the damper accurately to ensure its old-fashioned texture. Chimney damper versions range from cheap to premade fireplace damper. Ending2: [substeps] Most water-based fireplaces end with a top-sealing damper damper. This damper exists because the chimney chimney damper is dry enough to withstand collecting ashes and the chimney damper cannot insulate the poisonous air inside. Ending3: If you have trouble shooting fire, you could use your fireplace damper to replace the chimney damper's damper. [substeps] A top-sealing damper damper can be found at most home improvement stores. Ending4: This principle works year-round, whether you're heating or cooling your house. This product can be purchased online and is easily installed by either a homeowner or a handyman.

Answer format: ending1/ending2/ending3/ending4