Thermal buoyancy can be used as a tool for flow control and vortex shedding elimination. In the present study, a numerical investigation of the thermal buoyancy effect on the laminar flow and heat transfer characteristics of an elliptical cylinder with an isothermal surface was performed. The Richardson number varied from 0.0 to 1.5 for each angle of attack, while the Prandtl number is constant at 0.71. The Reynolds number was 1000 based on the major diameter of the cylinder, with an axis ratio (minor to major diameter ratio) of 0.25. The momentum and temperature equations were solved using a pressure-based in-house code with a second-order temporal and spatial accuracy. An initial examination showed that the thermal buoyancy led to the elimination of the vortex shedding or decrease in the flow separation area and also improved the aerodynamic performance of the cylinder. Additionally, it was discovered that insulation of the underside of the cylinder improved aerodynamic performance while reducing thermal energy consumption when compared to a fully isothermal cylinder. Other studies' findings indicated that the drag coefficient increased as the angle of attack increased; however, the Richardson number had little effect on the drag coefficient. The considered problem exhibited three distinct flow patterns: a vortex shedding region, a steady separated flow, and attached flow. Furthermore, a study on the heat transfer characteristics revealed that increasing the Richardson number increased the mean Nusselt number; however, for α > 15o, the convection heat transfer behavior was altered.