The present article discusses the applicability of various energy transport models in the analysis of mixed convection in a vented fluid-filled enclosure containing a heat-generating porous body, based on results obtained from a detailed computational analysis. The predictions of the equilibrium and the non-equilibrium models of energy transport in porous media are compared, along with additional comparisons between different types of interfacial heat transfer correlations within the non-equilibrium model, with a focus on the impact of thermal conductivity ratio. Although observations indicate qualitatively similar predictions by all models, substantial quantitative deviations are noticed in certain situations. Maximum deviations in fluid temperature (~27%) and solid temperature (~140%) are observed in the inertia-dominated flow regime and the buoyancy-dominated flow regime, respectively, for the largest thermal conductivity ratio. Among the interfacial heat transfer correlations, maximum deviation in fluid temperature (~7%) and solid temperature (~62%) are observed to be in the buoyancy-dominated flow regime for the largest and smallest thermal conductivity ratio, respectively. Deviation in heat transfer prediction at the cold walls is observed to follow a similar trend as in the case of fluid temperature.