The heat sensors main purpose is to automatically activate the hood system. A heat sensor switches between off and on based on the temperature underneath the hood. When the temperature is below the activation point is in the off position. When the sensor detects heat above the set activation point it goes into an on position. This allows the heat sensor to act as a automatic means to activate the hood fans. While this provides a simple method to activate the system, it should only be used as a secondary means to operate the system. This option does offer a simple backup to the hood switches for activation in the event a piece of equipment is left on while the kitchen is unattended or if the staff neglects cutting the hood system on.

- Snap-Disc Fixed Temp – This heat sensor is the most economical and simplest version of the heat sensor. These sensors have a non-adjustable set point.
- Snap-Disc Adjustable – This heat sensor is the next step up. Having the same footprint as the snap disc fixed sensor. These sensors do have an adjustable temperature range.


- Probe Style – This sensor offers the most flexibility. Having a extremely large temperature range and the ability to be screwed into a quick seal. It allows for removing and adjusting from the interior of the hood. This sensor does require calibration to maximize its operation.