[sk546]

If you don't have the Aux heater setting ticked in the climate menu in the sensus/google auto control screens then you will only get outside temperature air into the cabin until you end up running the ICE.
The Aux heater uses very little fuel and warms up the cabin very quickly (it also pre-warms the ICE fluids prior to it being needed reducing cold start wear) so I keep it turned on pretty much most of the time unless I'm doing very short trips (moving the car in the driveway or going to the local shop).