Temperature controllers are designed to maintain desired temperature levels, regardless of external conditions. Whether it needs to stay at one setpoint or exist within a range, these controllers ensure safety, reduce variability, and increase overall efficiency. Designed to fit into control panels, temperature controllers feature a number of control actions including PID, on-off, multi-loop, limit, proportional, and rate of ramp. With seemingly endless uses, temperature controllers are mostly utilized in commercial and industrial applications but can also be used in domestic applications.