If I read it correctly, and that's just about impossible to do, they are refering to two separate units: A thermostat which takes readings via remote sensors, and one which is incorporated into the cooling core to determine if the AC unit should be active or not. One presumably senses ambient temperature, and controls fan speed to that area. This in turn affects "suction" temperature (actually they mean "intake" or negative manifold pressure)by increasing or decreasing demand. The difference between intake temperature and core temperature is sensed by the body sensor (thermostat) which will either activate or deactivate the cooling unit.