We don’t have the extreme temperatures in Tx

(it did hit +19 for a few minutes the other day, we’ll probably hit 77 today)
We do have the same problem you have SO we keep the thermostat set on 68, maybe the auto temp display is in C and not F
Try this…touch the auto button, adjust temp to 68, and then touch 1, 2 or all 3 of the buttons to the left of the temp adjustment buttons. This will take control of where the heated air goes away from the X3’s
small brain and lets you control where the air goes. Hope this helps.
ab