This research looked at how installing solar panels on buildings affects power generation, energy use, comfort, and CO2 emissions. By trying different positions and directions for the solar cells in a building in Egypt, they found that putting solar cells on the walls and roofs reduced energy use by up to 40%. Solar cells on the roof facing south made the most power. South-facing cells also improved indoor temperature and comfort. North-facing cells made the least power but reduced CO2 emissions. Cells inside windows provided less light. Overall, solar cells can help save energy and make buildings more comfortable.