Dependency on renewable sources of energy has been soaring with the increase in human population. Hence, the abundant availability of the sun’s radiation is receiving increased attention as an alternative source of energy. However, area requirement for harnessing it has always been a constraint. Highly efficient solar energy harnessing techniques can resolve the issue. Solar air heating (SAH) systems with wide range of applications have vast research scope. With lower thermal capacity of air, researchers are focusing on intensifying the heat transfer rate by the introduction of various kinds of turbulators. In the current study, Ansys Fluent 18.0 is employed to investigate the influence of deploying hemispherical vortex generators on the efficiency of SAH. The renormalization k-ε model is used to resolve the required governing equations. The variation of corresponding pitch ratio, P/e, is from 2 to 3.33 in the current consideration for SAH with an aspect ratio of 13. Reynolds number variation is between 3500 and 16,000, and a continuous supply of heat per unit area of 1000 W/m2 is maintained on the absorbing plate section. The observations are compared with other literatures. Optimum geometry is considered for the set up with highest thermohydraulic performance factor.