One of the most common questions we get about heat exchangers is whether or not they need PID control. The answer, unfortunately, is not a simple yes or no. It really depends on the application and the specific needs of the process. In some cases, PID control may be necessary to maintain optimal performance, while in others it may not be required at all. Ultimately, it's up to the process engineer to determine whether or not PID control is needed for a given heat exchanger application.