A thermostat is a simple example for a closed control loop: It constantly measures the current temperature and controls the heater's valve setting to increase or decrease the room temperature according the user-defined setting. A simple method switches the heater or cooler either completely on, or completely off, and an overshoot and undershoot of the controlled temperature must be expected. A more expensive method varies the amount of heat or cooling provided by the heater or cooler depending on the difference between the required temperature (the "setpoint") and the actual temperature. This minimizes over/undershoot. This process is called PID and is implemented using a PID Controller.

Carrier Transicold - Provides refrigeration equipment for commercial vehicles. Includes new and retrofit installations.
Central States Thermo King - Supplies and services temperature controlled equipment for the transportation industry, and distributes cargo heaters and satellite tracking systems. Online dealer locator.
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Flettner Ventilator Ltd. - Manufacturers of wind powered rotary vents for vans, minibuses and other commercial vehicles.
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Thermo Engine Supply - Sells parts and supplies for refrigeration equipment including a complete line of Thermo King parts. Based in California.
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Thermo King - Produces temperature and climate control products for the transportation industry.
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Thermo King Christensen - Sells new and used refrigeration units and equipment.
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