I wonder whether ECO PRO affects the seat heater too, or just the regular heater/AC.
I also think the ambient temperature will have an effect on how effective it feels - if you heat the seat from 0 degrees up to 70, I'm sure you're going to feel it as much warmer than if you heat it from 50 to 70.
There's probably also a thermostat that prevents it from heating past a certain point, or if the ambient is too high. If it takes mere minutes to heat from -20 to 70, imagine what it would otherwise do if a kid flips the switch in a sun-parked car.
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