By means of cross ventilation skylights fresh air is maintained inside the house. By creating skylights, at the center of the house the natural daylight enters into the heart of the building, considerably reducing the dependence on artificial lighting. This is supplemented by a skylight roof and energy — efficient artificial lighting. An incandescent bulb only uses around 10% of the input energy to create light while the rest appears to be in the form of heat as waste.

Fig 5: Rain water harvesting technologies

The design criteria adopted in modular house design to possess a good quality of air and utilization of Natural Lighting is described in the below diagram.

Fig 6: Air circulation and utilization of natural light