- American Auto-Matrix
 - Designs and manufacturers building automation and access control systems, components, and software for various commercial and industrial control applications. - Automated Environmental Systems
- Designs and manufactures electronic sensors for HVAC and HA.
- Automation Components Inc.
- Manufactures sensors and transmitters for monitoring temperature, pressure, relative humidity, air quality, carbon monoxide, carbon dioxide, and current.
- Belimo Aircontrols, Inc.
- Electronic damper actuators for the operation of air dampers in HVAC systems.
- Building Automation Products, Inc. (BAPI)
- Sensors for the commercial heating, ventilation, air-conditioning and refrigeration (HVAC/R) industry.
- DEVI
- Manufacturer and distributor of electrical heating cables, mats, and thermostats for radiant heating systems.
- Digital Control Systems, Inc.
- Manufactures CO2 detectors and controllers for the HVAC, medical, research, and agricultural industries.
- Energex Enterprises, Inc.
- Sells the Door Miser and Cooler Miser: logic controls for heating and cooling systems.
- Energy Management Systems
- Offering automation products designed for the hotel industry.
- Enertel Controls Inc.
- Manufactures energy management electronic controls dedicated to the residential HVAC/R, home automation, commercial and industrial markets.
- Environmental Technology, Inc.
- Sensors and control panels for snow/ice melting, heat trace and radiant heating.
- Eurotherm Controls
- Manufactures temperature controls, process controllers, temperature indicators, SCRs, and multi loop control systems.
- Graham Company
- Manufacturer of adjustable freuqency drives for HVAC systems.
- Heat-Timer Corporation
- Manufactures controls.
- Honeywell, Inc.@
- Browse a collection of corporate Honeywell sites, including divisions for aerospace, industrial automation and control, and security products.
- Infitec, Inc.
- Manufacturer of timing, industrial, electronic, HVAC, process, and custom controls.
- Jackson Systems
- Designs, manufactures, and distributes forced-air zone control systems for the heating and air conditioning industry.
- Lux Products Corporation
- Carries electronic, programmable, and mechanical thermostats for heating systems.
- Neptronic
- Manufactures damper actuators, actuated control valves, humidifiers, and other HVAC controls.
- Novar Controls
- Manufactures a broad range of building automation control products.
- Onity
- Leading Provider of electronic locks, in-room safes, and energy management solutions.
- Paragon Controls, Inc.
- Manufacturer of airflow and pressure measurement control devices.
- Regin HVAC Products Inc.
- Offers products for controlling, testing and detecting heating, ventilation and air conditioning systems.
- Senercomm, Inc.
- Manufactures energy saving thermostats and guestroom automation software designed for the hotel industry.
- Telaire
- Offers a variety of carbon dioxide monitors and controls as well as infrared gas sensors.
- Teletrol Systems Inc.
- Designs, manufactures, and markets automation systems for commercial and industrial control applications.
- Temco Controls, Ltd.
- Manufactures sensors, relays, valves, controllers, and thermostats for the HVAC industry.
 Test Plugs Limited
- Manufactures test plugs, gauges, thermometers, and other accessories used to check pressure and temperature of live systems.- Trol-A-Temp
- Forced-air zone control systems for residential and light commercial applications.
- Twinco Supply Corp.
- Specialising in products and services to fulfill the automatic temperature control needs of the HVAC mechanical contractor.
- Weiss Instruments
- Produces thermometers, temperature, and pressure gauges for use in hydronics, hydraulics, refrigeration, and other applications.
- Zonex Systems
- Manufactures temperature and zone control systems for residential and commercial applications.
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