Its great in "normal" winters, warm down to -15 c in the entire cab, in a Yukon winter, like -40c the front stays warm, but the back is pretty cool, then again, I would expect to be dressed for it. It will start, without warm up or starting aids, with winter weight Diesel down to -27c, but expect a looooooong glow plug cycle time.
The heating fan is a bit loud on its full power setting, but hey...its Mil-Spec....It just means that when my lady yells at me when she's driving, (like when I'm being a back seat driver) she has an excuse to yell :wings: