Researchers are exploring ways to improve the performance of solar air heaters, with various studies examining the use of different designs and materials, such as corrugated plates, perforated baffles, and novel fin shapes. These studies are using a range of approaches, including experimental testing, artificial intelligence, and computational fluid dynamics, to evaluate the energy, exergy, environmental, and economic performance of solar air heaters. The investigations appear to be focused on optimizing the design of solar air heaters to enhance their efficiency and effectiveness.