Mechanical design begins with a strong understanding of load estimation for HVAC, water supply, drainage, and fire protection systems. Engineers must select and size equipment to meet building needs while optimizing energy use and sustainability. Designing efficient distribution systems—ductwork and piping—is essential for performance and space coordination. Integration with architectural and structural elements ensures systems are functional and buildable. Familiarity with codes such as ASHRAE, NFPA, and local regulations is critical for compliance and safety. This knowledge base enables engineers to deliver mechanical systems that are efficient, code-compliant, cost-effective, and aligned with project goals.