Caeli Energie is a French start-up aiming at developing innovative and sustainable cooling for residential application without using a compressor and refrigerants. The technology is derived from the principle of an indirect evaporative cooler and enables to reach the dew point temperature of the air that needs to be cooled. The aim of this master thesis is to assist in conceiving and designing a working prototype of the system by instrumenting it to emphasize and explain the main discrepancies with the theoretical model. First, the context of the project will be explained with a brief overview of both the technology used as well as the company structure.