winter is usually at least 3 months
aside from the warmer engine area and innards attracting the moisture that the colder ambiant air temp couldn't hold, I'd be very leery of having a heating element plugged in for 3 months straight, or even a few weeks, especially in a carport or garage attached to my house .... I do have a block heater in my truck, to get some heat in the cab
before moving out 
Bill
