But does it keep your truck cool? How about warm in winter? I know it gets cold in Kansas...

Right now there isn't even a heater in my truck. Gets realy cold and seems to take some of the joy out of a nice January drive. It's hotter than heck in a parade around here in July too! That is really my question. I'm not sure about an A/C unit in a bigbolt firetruck but a heater might just do the trick! Anybody put in an A/C unit?