Light possesses a wave nature. Phonons do too. Within the infrared portion of the spectrum, these waves have comparable energies leading to their interaction. Here, the interaction is leveraged to create tunable infrared filters that control transmission and reflection with no moving parts at the "push of a button" for applications in next generation imaging and on-chip spectroscopy. Practically, waferscale tunable infrared filters are first demonstrated by altering graphene's plasmonic dispersion using the dielectrics surrounding it resulting in gate-tunable variations (V < 10V) of reflectance by over 1 μm. These same filters are then integrated directly atop a broadband infrared detector in a proof-of-principle demonstration of a dynamically tunable pixel. Second, field induced changes in the phonons energies of lead zirconate titante (PZT) ferroelectric bilayers result in a tunable IR filter possessing high speed, latchable operation, and scalable fabrication. Taken together, the case studies highlight the utility of harnessing phonons to sculpt the spectral response of IR elements.