The air scarf is completely independent from the cars heating and air conditioning system so getting cool air from the A/C to come out of the air scarf vents would require running ductwork from the dashboard to the air scarf vents. A major re-engineering job.
I think it would be nice if the heater could be turned off so that it just blew air of the ambient temperature. I think that's better than nothing and wouldn't require tearing half the car apart to do.
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