2016 SE owner here, and found the forums while wondering about the heater performance.
I expected the modest performance of the electric heater, given the lack of a combusting engine, but was a bit surprised about:
1) The Climate Control's AC always staying on, even when the heat is set to HI, which, of course, conditions the air by dehumidifying it, but also cooling it to the point where I couldn't get any warm air.
2) When started but parked, I am unable to get any warm air whatsoever, even with AC off, temp to HI, and Air Circulation set to on.
The AC turning on can be worked about by turning it off, but I'm not sure how I'm supposed to get around not being able to get heat while parked. I don't think I saw any specific posts surrounding this issue -- is this as designed, or is this worth a visit to the dealer in search for a mythical TSB?
Best,