Change in Heating System?

[CaptDaveHowe]

I noticed when driving a loaner from Tesla upon a recent service appointment that the heat was almost non-existent. It was a cold, rainy day and when I turned the thermostat up all the way to 76, the heat did not go on. Now back in own 2015 S 85, with the weather getting colder, I'm noticing the same thing. Is this a soft ware (update) issue? My thought is that there may have been a software update to conserve energy. Anyone in the cold weather states experiencing the same?

 

[cwave1]

This is an issue with v7 up to around 2.9.12. If you search, you will find a few threads that have covered this in detail.

 

[ecarfan]

And here is one such thread Heat / HVAC on 7.0 - poor performance?
Note: although the thread starts with a post about poor heat in a "classic" S, it also includes posts about the problem in newer cars.