The article discusses how constructing energy-efficient buildings can save money and benefit society. By using a simulation tool called BE opt, the researchers analyzed different energy-saving strategies for building design. They found that while initial costs for green buildings are higher, the payback period is shorter due to lower ongoing expenses. By optimizing HVAC systems, insulation, and sustainable energy use, buildings can significantly reduce energy consumption. The study showed that investing in energy-efficient materials and equipment can lead to a return on investment in about two years, making it a viable option for commercial or official buildings.