Thermal radiation management poses fundamental and technological challenges. On the fundamental side, it touches on limits such as Kirchhoff’s law of emissivity–absorptivity equivalence and Planck’s bound on thermal emission. On the applied side, it underpins technologies ranging from daytime passive radiative cooling and enhanced solar cell performance to energy harvesting and thermal camouflage. In this work, we explore how the interplay between nonlinearities and a phononic driving can be harnessed to control the flow of thermal radiation. Using a Langevin framework, we show that a phonon field modulating a nonlinear system in contact with a thermal radiation reservoir can induce stochastic resonance, manifesting as noise-assisted, periodic transitions between metastable states. This mechanism offers a new pathway for dynamic control of thermal emissivity in nonlinear photonic systems.