A solar air heating curtain for installation on the wall or eave of a building consisting of a sheet of flexible translucent or transparent film facing outward from the building and a sheet of flexible film facing inward toward the building with both films joined around the perimeter forming an interior air volume, with a flexible air permeable material, that is heated when exposed to solar energy, suspended between the films, and a fan to move air from outside; through an air inlet, through the interior air volume in close contact with the air permeable material, and through an air outlet.