The high variability and low heat of fusion of composite shape-stabilized phase change materials is a considerable challenge to their widespread application. Here, we present the synthesis of shape-stabilized phase change materials composed of lauric acid and mesoporous silica with a high heat of fusion through evaporative solution impregnation. Two hexagonal ordered silica with 2.8 and 6.3 nm pores (MCM-41, SBA-15) and two disordered mesocellular foams with 27–34.9 nm spherical pores connected by 10.4–14.9 nm windows are employed. The thermal properties and stability, heat storage efficiency, crystallization, and textural and chemical properties are investigated using differential scanning calorimetry (DSC) analysis, small- and wide-angle X-ray diffraction (XRD), nitrogen adsorption–desorption isotherms, and optical and electron microscopy, as well as Fourier transform infrared (FTIR) spectroscopy. Mesocellular foam silica (MCF)-based materials with up to 83% wt fatty acid show large latent heat (124 J g...