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| 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 |
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| BAS | Building Automation System |
| BHP | Boiler Horsepower; also, Brake Horsepower |
| BMS | Building Management System |
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| CAD | Computer-Aided Design |
| CFM | Cubic Feet per Minute |
| CHW | Chilled Water |
| CMMS | Computerized Maintenance Management System |
| CO2 | Carbon Dioxide |
| COP | Coefficient Of Performance |
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| D-B | Design-Build |
| DB | Drybulb |
| DDC | Direct Digital Controls |
| DOAS | Dedicated Outdoor Air System |
| DOE | U.S. Department of Energy |
| DX | Direct Expansion |
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| EMS | Energy Management System |
| EPA | U.S. Environmental Protection Agency |
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| FPM | Feet Per Minute |
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| GPM | Gallons Per Minute |
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| HEPA | High-Efficiency Particulate Air |
| HTML | Hypertext Markup Language |
| HTTP | Hypertext Transfer Protocol |
| HWR | Hot Water Return |
| HWS | Hot Water Supply |
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| IAQ | Indoor Air Quality |
| IS | Information Systems |
| IT | Information Technology |
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| LEED™ | Leadership in Energy and Environmental Design, a designation by the U.S. Green Building Council |
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| MEC | Mechanical, Electrical, Communication |
| MEP | Mechanical, Electrical, Plumbing |
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| O&M | Operations and Maintenance |
| OA | Outside Air |
| OEM | Original Equipment Manufacturer |
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| PID | Proportional, Integral, Derivative |
| PM | Preventive Maintenance |
| PPM | Parts Per Million |
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| RFP | Request For Proposal |
| RFS | Request For Submittal |
| RH | Relative Humidity |
| RO | Reverse Osmosis |
| ROI | Return On Investment |
| RTD | Resistance Temperature Detector |
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| SCFM | Standard Cubic Feet per Minute |
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| TAB | Testing And Balancing |
| TES | Thermal Energy Storage |
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| UL | Underwriter's Laboratory |
| UV | Ultraviolet |
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| VAV | Variable-Air Volume |
| VFD | Variable-Frequency Drive |
| VSD | Variable-Speed Drive |
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| XML | Extensible Markup Language |
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| WAN | Wide Area Network |
| WB | Wetbulb |
| WC | Water Column |
| WG | Water Gauge |
