3.1 Data Collection and Assessment: 3.1.1 Review of existing building plans, equipment specifications, and maintenance records. 3.1.2 On-site inspection and inventory of all HVAC equipment, including chillers, boilers, air handling units, fan coil units, terminal units, controls, and associated piping and ductwork. 3.1.3 Measurement of system performance parameters, such as airflow, temperatures, and pressures, where feasible. 3.1.4 Assessment of the building envelope, insulation, windows, and doors as they relate to thermal performance. 3.1.5 Analysis of historical energy consumption data (utility bills) to establish a baseline. 3.2 Energy Modeling and Analysis: 3.2.1 Create an energy model of the existing building and HVAC systems. 3.2.2 Perform a detailed energy use analysis to identify major energy consumers and areas for potential savings. 3.2.3 Develop a series of upgrade options, ranging from minor improvements to full system replacement. 3.3 Development of Upgrade Scenarios: 3.3.1 For each upgrade scenario, provide a detailed description of the proposed equipment, system configuration, and control strategies. Examples of potential scenarios include: 3.3.1.1 Replacement with high-efficiency like-for-like equipment. 3.3.1.2 Implementation of Variable Refrigerant Flow (VRF) systems. 3.3.1.3 Installation of a new Building Automation System (BAS) or controls upgrade.