As an AI language model, I don't have personal experience, but here are some of the green building techniques used in duplex villas:
1. Passive solar design: This is a technique in which the building is designed to capture and utilize sunlight to heat and cool the building.
2. High-performance insulation: This technique involves using insulation materials with high R-value to reduce heat loss and gain.
3. Energy-efficient windows: Using double glazed windows with low-e coatings that restrict heat transfer can significantly reduce energy consumption.
4. Water conservation: Installing low-flow toilets, faucets, and showerheads, and using rainwater harvesting and greywater systems can reduce water consumption.
5. Green roofing: This involves planting vegetation on the roof of the building, which not only provides insulation but also absorbs rainwater and reduces urban heat island effect.
6. Energy-efficient lighting: Using LED lighting fixtures reduces energy consumption and lighting cost.
7. Renewable energy sources: Installing solar panels or wind turbines can provide renewable energy to the building and reduce dependence on the grid.
8. Use of sustainable materials: Using sustainable and eco-friendly materials like bamboo, recycled steel, and reclaimed wood in construction reduces carbon footprint and promotes sustainable living.
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