In addition to the wind-driven natural ventilation design addressed in this paper, it is possible to achieve natural ventilation through the buoyancy effect. Hirunlabh and coworkers [17-20] have published a number of papers on buoyancy-driven natural ventilation design for Thailand. The technologies used include the metallic solar wall [17], solar roof collector [18], solar chimney [19], and night radiant cooling [20]. The metallic solar wall can generate a ventilation rate as high as 1.65 ach in their model room. A similar ventilation rate has been found for the solar roof collector. The solar chimney seems the most effective having generated ventilation rates between 8 and 15 ach. Night radiant cooling can depress surface temperature by 1-6oC. The best designs may combine wind-driven ventilation with some of those technologies proposed by Hirunlabh and coworkers. Such designs can be a subject of further studies.