23 00 00 Heating, Ventilating, and Air-Conditioning (HVAC)
23 01 00 Operation and Maintenance of HVAC Systems
23 01 10Operation and Maintenance of Facility Fuel Systems23 01 20Operation and Maintenance of HVAC Piping and Pumps23 01 30Operation and Maintenance of HVAC Air Distribution23 01 30.51HVAC Air-Distribution System Cleaning23 01 50Operation and Maintenance of Central Heating Equipment23 01 60Operation and Maintenance of Central Cooling Equipment23 01 60.71Refrigerant Recovery/Recycling23 01 70Operation and Maintenance of Central HVAC Equipment23 01 80Operation and Maintenance of Decentralized HVAC Equipment23 01 90Diagnostic Systems for HVAC