Review project and DDC drawings.. Conduct diagnostic testing of HVAC systems, evaluate airflow, and troubleshoot mechanical and control issues.. Supervise installations, monitor system performance, and inspect construction sites for building-code compliance.. Prepare material takeoffs, labour estimates, project schedules, cost estimates, tender documents, and technical specifications.. Calculate plumbing, heating, cooling, air-distribution, and duct-sizing requirements.. Create HVAC and plumbing layouts, schematics, mechanical plans, design sketches, and as-built drawings using AutoCAD and Revit.. Review tenders and bids and recommend contractor selection.. Maintain facility drawings, plans, specifications, legal descriptions, maintenance procedures, and cost records.. Coordinate, inspect, and supervise contractors and assigned staff.. Develop and schedule maintenance activities and assist with budgets, commissioning, and final inspections.. Prepare technical reports and engineering data using specialized software.. Enforce occupational health and safety regulations and District safe-work practices.. Provide training and technical assistance.