Thanks, Craig, for the great writeup! The bit on the AC was especially useful. We've had a few -25F or colder days this winter, and I was baffled as to why the car would turn on the AC. (A note: when it's double-digits below zero, warm up the windshield a bit before turning on the wiper heater. I didn't and won a craked windshield right along the top of the heater. Also, I was interested to see that the invoice price of an OBXT heated windshield from ABRA is $2400! They billed my insurance about $1200 installed.)
This is probably a long shot, but is there any way to shift the temperature range of the ACC? Even 66 is too warm when dressed for -25. 55-75 would suit me much better.