These temperature controls have an air-coil or bimetal sensor that monitors and regulates the ambient air temperature. Controls with a bimetal sensor h ave the sensor inside the enclosure of the thermostat. Controls with an air-coil sensor have the sensor outside the housing of the thermostat. The sensor is directly in the airstream, so it gives a more accurate reading than bimetal sensors. These temperature controls are ideal for commercial and industrial HVAC applications where th e temperature needs to be monitored at the location of the thermostat, such as commercial refrigeration, agriculture, and heating and cooling installations.