We show the results of a mid and far IR study of ISO data of the CfA Seyfert sample. These data allow a detailed study of the far IR Spectral Energy Distribution (SED) of these galaxies. We find that the mid and far IR SED of Seyfert galaxies can be explained solely through thermal reradiation of high energy photons by dust, and, that this thermal emission is made up of two or three different independent components, a warm, a cold and a very cold dust component. These thermal components have been explained as produced respectively by warm dust heated by either the active nucleus or by circumnuclear starburts, cold dust heated by star forming region in the galaxy disk, and very cold dust heated by the general interstellar radiation field.