In recent years, green buildings have become a growing trend in the construction industry. Many people believe that installing solar panels or implementing greening projects automatically makes a building environmentally friendly. But is this really the case?

Buildings account for nearly 90% of Hong Kong's total electricity consumption, with residential homes, offices, and shopping malls contributing to nearly 60% of the city’s carbon emissions. Achieving energy savings and emission reductions through buildings is no easy task. On top of that, Hong Kong has over 40,000 existing older buildings. How can these aging structures be retrofitted to improve energy efficiency? What methods can be employed?