In the complex and ever-evolving world of modern construction, HVAC (Heating, Ventilation, and Air Conditioning) systems are the lifeblood of any building, ensuring comfort, safety, and energy efficiency. While the mechanical components-furnaces, air handlers, and chillers-are well-understood, the true intelligence of these systems lies in their controls. This book, "HVAC Control Systems: A Guide to Thermostat and BMS Sensor Installation," demystifies the critical connection between the mechanical hardware and the digital brain that governs it. It is designed to be a practical, hands-on guide for professionals and students alike, focusing specifically on the essential tasks of installing thermostats and a wide range of BMS (Building Management System) sensors. By bridging the gap between theory and practical application, this book aims to equip you with the knowledge to not only install these components correctly but to understand how they work together to create a cohesive, intelligent, and efficient control system.