As an AI language model, I don't have a specific information regarding duplex villas. However, here are some examples of active solar design features used in residential buildings that might be applicable to duplex villas:
1. Solar water heating system - a system that uses solar collectors to heat water for domestic use.
2. Photovoltaic (PV) panels - a system that converts sunlight into electricity.
3. Solar air heating system - a system that uses solar collectors to heat air for space heating.
4. Solar power skylights - a system that combines natural lighting with PV panels to maximize energy production.
5. Roof overhangs - a design feature that provides shade in the summer months and allows sunlight to enter the home in the winter.
6. Trombe Walls - a passive heating and cooling system that uses a wall of glass to absorb heat during the day and release it into the home at night.
7. Sunspaces - a solar space heating system that utilizes passive solar techniques, including south-facing windows, thermal mass, and natural ventilation.
8. Active shading systems - a system that uses adjustable shading devices, such as louvers or blinds, to regulate the amount of sunlight entering the home.
9. Solar chimneys - a passive cooling system that uses convection currents to create a natural flow of air through the home.
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