The answer to you question is this....The amount of heat and humidity passing thru the evaporator determines when the compressor cycles on or off. When there isn't much heat for the liquid freon to absorb, the pressure and temperature of the freon drops, so cycling off prevents the evaporator from freezing which is what will happen if the temperature and pressure keep falling. It also prevents liquid freon from reaching the compressor on some models. A device called an accumulator directly prevents liquid from reaching the compressor on most cycling clutch systems. When the liquid freon absorbs heat in the evaporator it becomes a gas which is what you want going into the compressor. Another device besides the low pressure switch that cycles the compressor is the evaporator thermostat. Therefore, you get more cycling on cooler drier days.

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