Since 1985 Luxaflex® Duette® Shades have combined visionary design with energy-saving technology. The unique 25, 32 or 64mm honeycomb structure, along with an extensive range of designs…Energy-efficient design, the innovative honeycomb design of Duette® blinds traps air to retain heat in the winter and reduce heat gain in the summer. Heat loss through windows is reduced by up to 55% according to the Fraunhofer Institute for Building Physics (IBP) in Stuttgart, Germany..