Urban heat island (UHI) which is the effect of having higher air temperature in urban areas, is the result of urbanization and changing the surface properties, as during the daytime, buildings and structures would absorb more solar radiation and reflect less. Conversely, during nighttime they emit more longwave radiation, and these phenomena exacerbate the effects of climate change, leading to higher energy consumption and reduced outdoor thermal comfort in urban areas. This research investigates the potential of green facades (GFs)—specifically Green Walls (GWs)—to mitigate the UHI effect and enhance urban thermal comfort under both current and future climate projections (2050). The primary research questions addressed in this study are: How do GWs affect thermal comfort in urban environments, particularly in terms of air temperature, mean radiant temperature (Tmrt), Universal Thermal Climate Index (UTCI) and their effect in reducing carbon emissions by decreasing buildings energy demand.