Did a test today in the garage (controlled ambient temp of 34F) - while plugged in, and at 75% SOC.
Placed a digital thermometer (which I know is fairly accurate from another project) right beside the cabin temp sensor under the screen. I did not sit in the car (to avoid any false readings from body heat), and waited ~10 minutes between settle times for each test.
Test 1: Car asleep - seems 'close enough'
Ambient 34F
Cabin Temp (in app) 40F
Actual Cabin Temp (as measured) 37F
Test 2: Set Auto Climate to 70F (keep setting)
Ambient 34F
Cabin Temp (in app, once stabilized) 70F
Actual Cabin Temp (as measured) 44.7F
Test 3: Set Auto Climate to 80F (keep setting)
Ambient 34F
Cabin Temp (in app, once stabilized) 80F
Actual Cabin Temp (as measured) 58F
I'm hoping that it's just the cabin temp sensor that is faulty, as the car *thinks* it is doing it's job correct and holding the temperature. My sense is that if the measured temp was correct, I would be fine.... it seems to be able to generate heat, just not being told to generate enough. Just put it on defrost, and it pounds out the heat!