In very hot weather, I've seen the car cool the battery (100*f). I still averaged over 3.0mi/kwh, bettering the EPA rating even with a fair bit of freeway driving. Actual range is @ 220mi in these conditions. In balmy weather of 70-80f, actual range is 250+ as the HVAC is used very little.So.... In sever cold weather it has to use juice from the battery to heat itself.
And in severe hot desert weather it has to cool itself, once again using its own power. And all of this depletes the range a rather large amount.
In 0*f weather, I get an actual range of about 145-150 miles. This is 25% less than EPA rating, roughly. I have not noticed the battery warming itself even down to -7*F, and even when it was parked in an open parking garage, ambient 6*f. The car just keeps the front flaps closed is all. Power is fine and so is heat. No issues. When parked in 6*f ambient in that garage for 14 hours, it was at the same SoC % that I left it at, btw.