23 0900 - HVAC Instrumentation & Controls
Acme Engineering Products 
Gas detection systems for building ventilation control. Gases detected include CO, CO2, Diesel fumes, refrigerant leak, VOCs and Oxygen deficiency. Single and multipoint/multigas systems. See website for literature and specifications.
ERDCO Engineering Corporation
Flow meters, gauges, switches and transmitters for chilled water, air and other fluids. We employ elegantly simple measuring techniques with proven reliability in utility fluid applications.
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See also: 25 5000 - Building Automation and Control
Acme Engineering Products 
Gas detection systems for building ventilation control. Gases detected include CO, CO2, Diesel fumes, refrigerant leak, VOCs and Oxygen deficiency. Single and multipoint/multigas systems. See website for literature and specifications.
ERDCO Engineering Corporation
Flow meters, gauges, switches and transmitters for chilled water, air and other fluids. We employ elegantly simple measuring techniques with proven reliability in utility fluid applications.
- Field Controls
- Fireye
- Flow Design
- Fluidmaster - Pro-Temp controllers
- GE Industrial Systems
- Genesis International
- Griswold Controls
- Heat-Timer Corp.
- Home Comfort Zones
- INTEC Controls - Gas detection: CO, CO2, NO2, combustible, refrigerants. Sensors: temperature, pressure, humidity, current. Damper actuators / valves.
- Intellidyne
- Intellisenc - Air quality sensors, controllers and transmitters; CO2, CO, VOC, O3, humidity and temperature.
- Intermatic
- Invensys Climate Controls Americas - Includes Firex, Robertshaw, Ranco, Paragon, Invensys, Com-Trol, DuraDrive, Erie, I/A Series and Enerstat.
- ISTEC Corporation
- ITT McDonnell & Miller - boiler controls
- Jackson Systems
- Johnson Controls
- KMC Controls
- Lightstat
- LUX Products Corporation
- MAMAC Systems
- Mammoth-WEBCO - Custom air conditioning systems, innovation, energy efficiency, low sound levels and long-lasting products.
- Mid-West Instrument
- Moeller Instrument Company
- Neptronic
- Notifact Corp.
- Onicon
- Onity - Onity is a leading provider of electronic locks, in-room safes and energy management systems.
- Orange Research
- Paragon Controls
- Phoenix Controls Corp.
- Porter Instrument Co.
- Preso Meters
- Profile Systems
- PSG Controls
- PureChoice
- Rawal Devices
- Regin HVAC Products
- RG Group
- Rotronic Instrument Corp.
- SeaMetrics
- SenTech Corp.
- Siemens Building Technologies
- Sparling Instruments
- SSI Technologies Inc. - Controls Division - Pressure, level and magnetics sensors and sensor based products.
- Sterling
- Systems Controls & Instruments
- TAC - TAC, a leader in building automation, security and energy solutions, provides open, integrated building management solutions.
- TCS/Basys Controls
- Tek-Air Systems
- tekmar Control Systems
- Teletrol Systems
- Tel-Tru Manufacturing Company
- Temco Controls
- Tjernlund Products - Modulating draft, combustion air fans for boilers and heaters. Minisplit room to room fans.
- Trane - Trane is a manufacturer of air conditioning equipment, controls, service and parts for commercial buildings.
- H.O. Trerice Co.
- Triatek Inc. - Triatek provides airflow control systems, variable air volume (VAV) controls, and controls for laboratory ventilation.
- Uni-Gard
- Variadigm Corporation
- Viconics
- Waddell Engineering Co.
- Warren Technology
- WattMaster Controls
- Weed Instrument
- Weiss Instruments
- Weksler Glass Thermometer Corporation
- Wika
- Winters Instruments
- Zonex Systems