Your Mister Freeze Revitalizer Kit comes with a digital temperature display that is on top of the AccuFill® Trigger and a vent sensor that is stored inside of the trigger. As you get to the later steps, the sensor that is snapped to the interior vent will connect wirelessly to the temperature display which will show the output vent temperature. Your target temperature should be -17°F to -23°F degrees below the outside temperature. So for example, if the outside temperature is 80°F, your target temperature should be between 63°F to 57°F. Refer to the chart on our instructions page here.