The use of natural materials especially fatty acids as phase change materials (PCM) for different applications is considered as a current challenge for the scientific community. The main advantages of fatty acids are that they cover a wide range of melting temperatures and consume a good amount of latent heat while transiting from a state of aggregation to another. This work focuses on Arachidic acid, a fatty acid which presents some remarkable thermal properties that enable its use as PCM. Arachidic acid is mixed with different chemical salts in a cost-efficient manner, in order to alter its thermal characteristics. The main objective of the modifications is to maintain high latent heat, with a wider span of melting temperature and a smaller melting peak temperature to accommodate with the allowable electronic devices' temperatures. Specific properties such a s the heat capacity, the new latent heat (J/g), and peak temperature (degrees C) were determined in order to analyze the reliability and stability of fatty acids as PCM. The results showed that Arachidic acid mixed with 10 mol% sodium decanoate exhibited the highest melting point depreciation, from 75.2 degrees C to 71.9 degrees C, while maintaining a high latent heat of fusion (222 J/g).