An agricultural baler has a baling chamber with a plunger that is provided to reciprocally move in the baling chamber, the baling chamber walls separating the baling chamber from the environment, wherein the baling chamber walls include fluid channels formed at the environment side of the wall and directly adjacent to the baling chamber in such a manner that, during operation of the agricultural baler, heat is transferred from the baling chamber wall to fluid in the fluid channels, and the fluid is moved along said fluid channels during operation of the agricultural baler.