A furnishing element with a conditioning function, which includes a base structure having a determinate aesthetic and/or functional conformation for furnishing, and one or more conditioning components, able to carry out a heat exchange with the environment to determine the conditioning thereof. The base structure defines at least a radiant surface and is made by lost mold casting. The mold or core used for casting is destroyed at the end of casting. The conditioning components are constrained to the base structure and are suitably shaped to be disposed in proximity to the radiant surface, so that the radiant surface determines a desired radiation, able to condition a room and/or one or more users.