Yes, Vietnamese Cam Thuy Bluestone can be used for exterior applications in hot climates. Bluestone is a durable natural stone that is known for its resistance to heat and weathering, making it suitable for outdoor use. The heat resistance of the stone ensures that it can withstand high temperatures without damage or color fading. Additionally, the natural cooling properties of the stone make it comfortable to walk on even in hot weather. However, it is important to note that proper installation and maintenance are crucial to ensure the longevity and performance of any stone material.