Think about it...if the system does not have a specific temperature sensor, how does it know what the temperature is? Well, MOST salt systems rely on what the system is putting out as amps and volts. Amps and Volts are largely dependent on the Salt Level, Cell Condition (worn out or scaled), or water temperature. These three parameters determine the conductivity level in the water. If water temperatures fall, increasing salt will compensate. Again, keep within the recommended salt range. You are correct though, most systems do shut off when it gets too cold, or more correctly, when conductivityq reduces.