Under the supervision of the Superintendent of Buildings: Supervises a crew of workers and performs hands on tasks related to installation, repairs, and maintenance to heating, ventilating and air conditioning equipment; Systems including refrigeration units, air and water filters, motor, fans, air compressors, condensers, pumps, boiler, chiller plants and automatic temperature controls. Inspects equipment for malfunction and makes adjustments and/or corrections. Checks equipment and systems for proper temperature, operation and climatic conditions. Lubricates motors and bearings. Replaces worn and defective parts; and performs related work and other tasks as required. Reasonable accommodations may be made to enable individuals with disabilities to perform the essential functions. MINIMUM REQUIREMENTS: Minimum two (2) years demonstrated experience in institutional HVAC and Refrigeration Systems operations, maintenance, repairs, and installation. Certificate of completion from accredited vocational school curriculum in HVAC, Refrigeration Training Program. Current EPA 608 Universal Refrigerant Certification. Commonwealth of Massachusetts License as Refrigeration Technician or Refrigeration Contractor. Valid Class D Driver?s License. Experience with direct digital control-based energy management systems preferred. PHYSICAL DEMANDS: All labor positions, skilled, semi-skilled, and unskilled in the Cambridge Department of Public Works require a combination of: Lifting between 25-100 pounds, proper bending, squatting, stretching, pushing, climbing, dragging, pulling, and reaching. Ability to climb ladders. WORK ENVIRONMENT: Exposure to all weather conditions. Work in a moderate to high noise level environment caused by sound of machinery or powered equipment being used. Occasional odor may occur during work. General inside buildings environment including entry and exit into confined spaces. REQUIRED DOCUMENTS: Resume