Within the last decade, the prediction of the thermodynamic properties of solid‐state materials based on first‐principles quantum‐chemical methods has matured to a degree that allows for quantitative applications in real‐world scenarios. The key ingredient for modeling the thermodynamic potentials and their temperature dependence is given by the accurate simulation of lattice dynamics as described by the phonon model. On the basis of the electronic as well as phononic energies (plus other energetic contributions, if needed), macroscopic thermodynamic potentials such as the Gibbs free energy are accessible via the quasi‐harmonic approximation for any given solid‐state material, at least in principle.