in addition to the house orientation, the house width-length ratio can be important in determining the amount of natural ventilation. Olgyay [12] suggests that the optimal ratio for a house in hot and humid climates is 1:1.7, with the long sides facing north and south. This design seems appropriate in suburban Bangkok, especially since the prevailing wind is mostly from the NNE and SSW, so there is no confict between wind alignment and the solar alignment