Temperature Controller Thermostat are devices that regulate the temperature of a space or apparatus by sensing its temperature and comparing it to a set point. They can control temperature automatically by turning heaters, coolers, and other equipment on or off as needed. Temperature Controller Thermostats provide accuracy, reliability, and ease of operation for many commercial and industrial environments. By using a combination of digital inputs and outputs, these thermostats are capable of controlling one or more systems with minimal effort.