This collection of standards demonstrates the global diversity in HVAC practices, tailored to regional needs and climate conditions. For international projects, understanding and complying with local standards is critical for successful system design and implementation. These standards are essential for verifying the performance, efficiency, and reliability of HVAC equipment. They provide a consistent basis for product evaluation, ensuring that equipment performs as expected under real-world conditions. These standards are also particularly valuable for equipment selection, energy efficiency compliance, and ensuring occupant comfort. Always consult the latest standards and coordinate with other guidelines for a comprehensive approach to HVAC design and system integration. This chapter lists the standards and codes used globally in HVAC design and building services, categorized by regions and countries. These standards cover various aspects of HVAC systems, energy efficiency, indoor air quality (IAQ), fire safety, and building performance.