It’s 8 degrees outside and your car is parked outside, so it’s 8 degrees inside the car.
You start the engine, and set the thermostat to 20. In response the system starts to heat the air up from 8 to 20.
Now you get in the car. You’re cold, because your body is 37 on the inside and about 24 feels most comfortable, because that allows your body to reject the heat that it generates.
Even after the cabin temp reaches 20, the air still cools you because it’s cold, and blowing right on you. Even air as high as 30 could feel cold, thanks to the cooling effect of it blowing right on you, because 30 is less than your internal body temp of 37
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