Trees are considered the most valuable components in the landscape in cities due to their large size and high efficiency in protecting the environment. The trees are recommended to be planted in cities. However, most municipalities look for the aesthetic appearance and economic aspects before any other statements related to environmental protection and the effects of climate change. In this study, we attempt to investigate the high temperatures, one consequence of climate change, that has major economic impacts on societies through high energy consumption and the lack of thermal comfort for citizens. The study focused on identifying the superior trees planted in Ismailia City in terms of their ability to cool the air surrounding the trees and their location. We selected healthy trees representing a variety of trees grown under the same conditions for the experiment. The temperature of the leaves and the temperature of the air directly adjacent to the leaf were measured with the HTC-2 device between 10 and 12 a.m. in August 2023, with repeating the measurement on three successive Sundays. The results indicate that trees belonging to the genus Enterolobium have the highest ability to reduce heat and the highest efficiency in increasing heat dissipation, thus reducing the temperature of the surrounding environment, followed by Schinus molle trees. Both Ficus retusa and Delonex regia had a suitable effect on the cooling capacity. Bombax trees had the least impact on the environment in terms of cooling capacity in Ismailia City.