Upgrading windows is an eco-friendly approach to improve energy efficiency and sustainability in buildings. Transparent solar panels and electrochromic windows offer innovative solutions for renewable energy generation, light control, and occupant comfort. These windows are available worldwide, with different technologies and features tailored to meet the specific needs of environmentally conscious consumers. While cost considerations exist, the long-term benefits in terms of energy savings, reduced carbon emissions, and sustainable living make upgrading windows a worthwhile investment.