Given the challenges in providing efficient and non-harmful refrigeration, it is timely to study barocaloric systems, which offer cooling power via the application of pressure, something which is far more trivial to do than applying a magnetic field as required for magnetocalorics. The majority of caloric materials investigated so far have been based on expensive and relatively scarce rare-earths metals. Ammonium sulfate, by contrast, is widely and cheaply commercially available. It has been demonstrated that small changes in hydrostatic pressure drive giant inverse barocaloric effects near the ferroelectric phase transition. It is therefore our aim to investigate the phonon dispersion in this material near the transition to gain insight into the origin of the barocaloric effect. Successful measurements would be extended to applying hydrostatic pressure in the future.