Ionic liquids are low melting salts that have received tremendous attention due to their potential in a wide variety of applications. One of these is absorption refrigeration. In a conventional refrigeration unit a compressor, which is the major energy requirement, is used to increase the pressure of the working fluid in the cycle. In absorption refrigeration the working fluid is absorbed into a liquid. Then a pump, which requires comparatively little energy, is used to pressurize the liquid. A heat source is needed to desorb the working fluid at high pressure. The two commercially available systems, LiBr/water and water/ammonia, have many practical disadvantages. Ionic liquids are being explored as the absorption fluid for a variety of different absorption refrigeration systems. Here we will present the necessary thermodynamic measurements, including heat capacities and heats of mixing, and calculations that show very favorable coefficients of performance compared to commercial systems.