By controlling adequate preparation conditions and selecting polymer materials as the shell in microencapsulation, shells with various thickness, hardness, aqueous solubility, and molecular weight can be produced. Microcapsules loaded with tetradecane as the core material, which has a high heat capacity, were prepared by in-situ polymerization methods. Melamine-formaldehyde resin was used to form the polymeric shell of the capsules. The size and size distribution of the capsules were determined using an optical microscope and particle size analyzer. The thermal properties were also investigated using a differential scanning calorimeter (DSC), and the durability of the prepared capsules was tested with three kinds of pumps. It was shown that the capsules had a high latent heat capacity, uniform shape and size, and excellent durability. Accordingly, it was demonstrated that the capsules prepared in this study show good performance for the potential application in heat transportation.