You guy's need to get some motorcycle gear, 12v that is. I got a jacket from Whitehorse Gear in NH.
Heated Apparel - Electrically Heated Gear - Apparel - Whitehorse Gear They are close to me & the guy there actually talked me out of the pant's & gloves. He said to start with the jacket and by keeping your "core" warm really makes a big difference, and pant's, gloves, socks, can all be added later if needed. He was right and saved me at least $100. Good honest folks there that I think are primarily a mail order outfit but do have a nice showroom. This runs off the tractor 12v system and has a controller to adjust the heating level. I plow a small route of about 25 driveways for a friend and it takes about 5 hours. I have not found that I need the pants, gloves, etc. I have about $250 into the jacket, some connecting wires & the controller and I feel that was well spent money. 95% of the (year) time I'm in the woods with my tractor and hopping on & off and for my use, I'd destroy a cab in a hurry.