Under direction, performs skilled heating, ventilation, and air conditioning (HVAC) systems work, including maintenance, repair, installation, alteration, and construction of District buildings HVAC systems and equipment; inspects, maintains, and adjusts HVAC equipment; performs preventive maintenance on HVAC systems; repairs, rebuilds, and replaces defective parts in HVAC units; responds to work orders and HVAC emergencies; provides recommendations on the design and installation of HVAC systems for new construction and existing facilities; maintains inventory of HVAC supplies, equipment, and tools, and performs other duties as assigned.