23 00 00 "Heating, Ventilating, and Air-Conditioning (HVAC)"
23 01 00 Operation and Maintenance of HVAC Systems
23 01 10 Operation and Maintenance of Facility Fuel Systems 23 01 20 Operation and Maintenance of HVAC Piping and Pumps 23 01 30 Operation and Maintenance of HVAC Air Distribution 23 01 30.51 HVAC Air-Distribution System Cleaning 23 01 50 Operation and Maintenance of Central Heating Equipment 23 01 60 Operation and Maintenance of Central Cooling Equipment 23 01 60.71 Refrigerant Recovery/Recycling 23 01 70 Operation and Maintenance of Central HVAC Equipment 23 01 80 Operation and Maintenance of Decentralized HVAC Equipment 23 01 90 Diagnostic Systems for HVAC