VIDEO: Installing an AC Coolingstat for temperature control

Okay, I am totally confused. The video says the AC is either on or off and has no temperature control. That is simply not true. The knob on the left side selects the mode, fan, high or low cool etc. The knob on the right sets the temperature the AC cycles at. My AC turns the compressor on and off depending on how I set the temperature. I can set it so my camper will freeze me out, or hardly cool at all. Every rooftop unit I have ever worked on with the controls in what is called the air box works this way.