Because dynamical instabilities involve double-well potentials that are stabilized by fourth-order anharmonicity, it is critical to accurately obtain Φ 4 at minimum for the successful execution of the process. This iterative convergence routine is merged with the HiPhive codebase, where it resides under the Renormalization class. The primary advantages of this approach are the efficiency of statistical sampling of thermal ensemble via quantum covariance and the direct determination of Φ TD 2 by known IFCs without invoking DFT.