Yes, Spains Arenisca Dune Sandstone can be used for exterior applications in hot climates. Sandstone is a durable and weather-resistant material that can withstand various climatic conditions, including hot temperatures. Arenisca Dune Sandstone, specifically, is known for its heat resistance and ability to remain cool even in direct sunlight. Therefore, it is considered suitable for outdoor applications in hot climates. However, it is always recommended to consult with a local architect or expert to determine the specific suitability of any stone for a particular hot climate.