In the HVAC construction industry, the roles of a Construction Manager, Project Manager, and Site Manager often overlap but have distinct focuses. Project management primarily emphasizes planning, scheduling, budgeting, and overall project coordination, ensuring the design, procurement, and compliance aspects align with project goals. Site management, on the other hand, focuses on on-site activities, including workforce supervision, safety enforcement, quality control, and daily task execution. The overlap occurs as both roles require collaboration to address installation challenges, maintain timelines, and ensure the system is installed per design specifications, creating a need for close coordination between planning and on-site operations. However, the Project Manager typically retains overall authority and accountability for project completion and success. This chapter states a detailed breakdown of their tasks and responsibilities.