Complete Controls
AMCON CONTROLS, INC maintains a large inventory of controls and control devices for use in Commercial Environment Control Systems and Energy Management Systems.
http://www.completecontrols.com/

Modularm Temperature Alarm Manufacturer
Manufactures temperature alarms and monitors, door alarms and monitors, and temperature data loggers for refrigeration (freezers, refrigerators) and other applications.
http://www.modularm.com/

Hampshire Controls Corp.
Hampshire Controls: manufactures temperature alarms, temperature monitors, and data logging-data acquisition systems. They also make over-temperature, high temperature alarms and monitors, and freezer and refrigerator alarms and monitors.
http://www.hampshirecontrols.com/

Temperature World
Temperature sensors, Temperature controls, Heaters, Temperature instrumentation
http://www.temperatureworld.com/shci.htm

TIP Temperature Products
Controllers,Temperature Controllers, Recorders, Calibration Equipment, Thermocouples, RTD's, Data Loggers, Heaters, Infrared, and Flowmeters.
http://www.mytiptemp.com/

Akinsun Heat Co.
Manufactures of complete line of electric heating elements, temperature sensors, temperature controls and accessories to heating element. Akinsun manufactures a wide variety of heaters like cartridge, quarts, ceramic, band, strip, bolt, tubular, coil, M.I. Cable etc.
http://www.akinsun.com/

Accurate Temperature Control Corporation
Manufacture of thermocouples, temperature controls, heating elements, wire and accessories.
http://www.tc100.com/

Contronautics, Inc.
Temperature Control PID Programmable and Temperature Scanner or Temperature Monitor with Overheat Alarm and Thermocouple; RTD; T/C; CN616; CN606; CN612; CN601; IPS-7; Zone Temperature Underheat Alarm; Contronautics;
http://www.contronautics.com/

Direct Digital Controls
Chicago,IL full service temperature controls contractor.
http://ddc-controls.com

Almeg Controls
Manufacturing controls and probes for level, flow, pressure and temperature.
http://www.almegcontrols.com/