The gas distributor is an important part of fluidized bed reactor, which directly affects the uniform distribution of gas and fluidization quality. Therefore, the performance of fluidization is strongly dependent on the design of air distributor. For this purpose, this study has been done to focus on the temperature of the air without and with swirl components. A bubbling fluidized bed reactor with an internal diameter and height of 0.06 m and 1 m, respectively is used. Air flows through a distributor plate and also through a vertical helical pipe to impart swirl component. First, the fluidizing air is uniformly distributed at the ambient temperature and the minimum fluidization velocity (U_mf) is determined by using pressure measurements. Further, to examine the temperature effect on the pressure drop and performance of the swirl air, the air has been preheated to various initial temperatures. Eventually, the temperature effects on fluidization and pressure fluctuations are established for air flow without and with swirl component. Moreover, the distributor to bed pressure drop ratio is analysed to examine the presence of non-uniform solid-gas mixing inside the reactor.