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To get the most from this WOULD require setting up an a/c switch to turn on/off as necessary and it is true that most cars just adjust the hvac doors inside the dash. Even with it on 100% of the time though, there is some misinformation in this thread. The a/c compressors cycle on and off based on refrigerant pressure. Heat exchange is what causes refrigerant to switch between gas and liquid states, low and high pressure. When less heat is transferring into the evaporator in the vehicle cabin (due to less cabin heat), the pressures do not change/rise as much on the low pressure line as in a warmer cabin. This in turn requires the compressor clutch to cycle on less to retain the proper high and low pressure in the a/c system. Because it is a closed system that uses an orifice for phase change, pressures do even out between the low and low side with time so there are other variables involved but basically, you will save energy from the a/c compressor being engaged on less.
Noticeable at the pump, likely not at all.
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