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The US department of energy and the country's building industry has launched a 20-year plan to make homes more energy efficient for their occupants. Under the 'Building Envelope Technology Roadmap', the building industry in the US plans to become net producers of energy, with movable walls and rooms that adapt to changing needs and environmental factors. Intelligent features could adjust the interior climate based on the weather and provide naturally derived lighting and ventilation to enhance comfort and occupant health, envisions the plan.