This study investigates the impact of inlet pressure and temperature of reactants, on the performance of an energy system powered by a proton exchange membrane fuel cell (PEMFC) for electricity production. A thorough energy analysis was conducted using thermodynamic modeling implemented in Matlab to assess the influence of these parameters on the overall system performance. Simulation results were carefully compared to those obtained in specialized literature, thereby reinforcing the validity of the conclusions. The parametric analysis reveals that increasing the inlet temperature of reactants from 303.15 K to 343.14 K results in a significant improvement in system efficiency (PEMFC) with an average increase of 8.96%. Conversely, raising the inlet pressure from 1.2 atm to 3.2 atm negatively affects the overall system performance (PEMFC), leading to an average decrease of 19.5%.