Abstract: A heat retrieving device is disclosed which directs cool incoming fresh air down a duct within a flue pipe. Hot gasses in the flue pipe heat the incoming air, warming it sufficiently so that it can be discharged directly into a room that is to be heated, thus supplementing the existing heating system. In the preferred embodiment, the upper exterior portion of the exhaust flue is an inverted L-shape that is mounted on a rotatable bearing. A weathervane having an air scoop on one end and both a main vane and a pilot vane on the other end is securely mounted in the horizontal portion of the flue pipe, causing it to rotate into the wind. The upper portion of the duct within the flue pipe is also bearing-mounted and terminates into the fresh air scoop which exits from the flue pipe. Said air scoop is preferably located directly below the air scoop of the weathervane. As the air scoop of the weathervane turns into the wind, the air scoop of the fresh air intake duct also turns into the wind.