This study presents experimental results on so-called cTES (for cold Thermal Energy Storage), in the specific configuration of coupled heat and moisture storage. An effective improvement of coupled sensible/sorption energy storage is presented, by the development of a new sensible/sorbant material made of glass sphere coated with a mixture of AQSOA Z05 zeolith and PDMS Sylgard 184. The process of manufacturing and the characterization of the equilibrium isotherms of the coating are first presented. Main result show that the new coating is highly effective with more than 95% of the sorbant material being active. The experimental characterization of the thermal behaviour at prototype scale (>approximately 440 kg of coated spheres and 270 kg of uncoated spheres) is then presented. The results highlight effective operation of the cTES, i.e. water storage during adsorption and flattening of the ambient air temperature during desorption.