Magnetocaloric materials as solid-state refrigerants for cooling devices based on the magnetocaloric effect that changed its temperature depending on external magnetic field. The industrial applications are divided depending on operating temperature that indicated the magnetocaloric effect. Mostly, the studies are focused on the magnetocaloric materials operated for near room temperature. Several compounds such as Gd₅(Si,Ge)₄, La(Fe,Si)₁₃, and (Mn,Fe)₂(P,Si/Ge) alloys are known as magnetocaloric materials with large magnetocaloric properties near room temperature.[1,2] These magnetocaloric materials have developed towards large magnetocaloric properties as well as lower cost to apply for industrial field. Obtaining large magnetocaloric properties is possible by controlling the kind of compounds, composition, and additional elements.[2-4] In addition, manufacturing processes such as cooling rate and annealing conditions (temperature and time) affect the microstructure, magnetocrystalline anisotropy, and formation of secondary phases. As a result, the magnetocaloric properties can be tuned.[5-8] In this study, the control methods by additional elements which can improve magnetocaloric properties near room temperature will be described. In addition, the effect of intrinsic and extrinsic factors (microstructure and so on) on the magnetocaloric properties will be highlighted, and the methods to apply for cooling devices will be proposed.