Urban form and energy efficiency are linked, but climate plays a big role. Researchers studied how different city layouts affect energy use in Greek cities with different climates. They looked at building shapes and sizes in Thessaloniki and Heraklion to see how they impact heating and cooling needs. The results show that urban design can significantly affect energy efficiency, with certain building shapes being more efficient in different climates. This information can help cities plan for sustainability based on their specific climate conditions.