| A |
| A/C | Air Conditioning |
| ACH | Air Changes Per Hour |
| AE | Architectural and Engineering; or Architect and Engineer |
| AFD | Adjustable-Frequency Drive |
| AHU | Air-Handling Unit |
| ASD | Adjustable-Speed Drive |
| ASHRAE | American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc. |
| ATC | Automatic Temperature Control |
| B |
| BAS | Building Automation System |
| BHP | Boiler Horsepower; also, Brake Horsepower |
| BMS | Building Management System |
| C |
| CAD | Computer-Aided Design |
| CFM | Cubic Feet per Minute |
| CHW | Chilled Water |
| CMMS | Computerized Maintenance Management System |
| CO2 | Carbon Dioxide |
| COP | Coefficient Of Performance |
| D |
| D-B | Design-Build |
| DB | Drybulb |
| DDC | Direct Digital Controls |
| DOAS | Dedicated Outdoor Air System |
| DOE | U.S. Department of Energy |
| DX | Direct Expansion |
| E |
| EMS | Energy Management System |
| EPA | U.S. Environmental Protection Agency |
| F |
| FPM | Feet Per Minute |
| G |
| GPM | Gallons Per Minute |
| H |
| HEPA | High-Efficiency Particulate Air |
| HTML | Hypertext Markup Language |
| HTTP | Hypertext Transfer Protocol |
| HWR | Hot Water Return |
| HWS | Hot Water Supply |
| I |
| IAQ | Indoor Air Quality |
| IS | Information Systems |
| IT | Information Technology |
| L |
| LEED™ | Leadership in Energy and Environmental Design, a designation by the U.S. Green Building Council |
| M |
| MEC | Mechanical, Electrical, Communication |
| MEP | Mechanical, Electrical, Plumbing |
| O |
| O&M | Operations and Maintenance |
| OA | Outside Air |
| OEM | Original Equipment Manufacturer |
| P |
| PID | Proportional, Integral, Derivative |
| PM | Preventive Maintenance |
| PPM | Parts Per Million |
| R |
| RFP | Request For Proposal |
| RFS | Request For Submittal |
| RH | Relative Humidity |
| RO | Reverse Osmosis |
| ROI | Return On Investment |
| RTD | Resistance Temperature Detector |
| S |
| SCFM | Standard Cubic Feet per Minute |
| T |
| TAB | Testing And Balancing |
| TES | Thermal Energy Storage |
| U |
| UL | Underwriter's Laboratory |
| UV | Ultraviolet |
| V |
| VAV | Variable-Air Volume |
| VFD | Variable-Frequency Drive |
| VSD | Variable-Speed Drive |
| X |
| XML | Extensible Markup Language |
| W |
| WAN | Wide Area Network |
| WB | Wetbulb |
| WC | Water Column |
| WG | Water Gauge |
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