This course provides a comprehensive introduction to Heating, Ventilation, and Air Conditioning (HVAC) systems, focusing on design principles and practical applications. Students will explore the fundamental purpose of HVAC, including heating, ventilation, and air conditioning requirements for residential, commercial, and industrial spaces. The course covers the roles and responsibilities of HVAC design engineers and career opportunities in the field. Core concepts such as units of measurement, unit conversion, pressure, temperature, and fluid flow are thoroughly explained. Participants will learn the principles of heat, its types, formulas, and heat transfer mechanisms, along with the laws of thermodynamics as applied to HVAC systems. Refrigerants, tonnage calculations, and system efficiency considerations are also emphasized. Applications across various industries, including energy-efficient building design, process cooling, and indoor air quality management, are discussed. Practical examples and design scenarios enable students to apply theoretical knowledge effectively. By the end of the course, learners will understand HVAC system components, performance evaluation, and design optimization. This foundation equips students to design safe, efficient, and sustainable HVAC solutions. Hands-on exercises and case studies reinforce problem-solving and analytical skills. The course is ideal for aspiring HVAC engineers, building services professionals, and technical designers aiming to enhance their expertise in modern HVAC systems.