That is a good point Luke....leaving it on wouldn't be good probably, it must draw a bunch of amps right?
I like the momentary switch, are those adjustable as well?
And correct on the winter driving...at this point in the year it will be sleeping for the winter. So maybe down to mid 30's if we get a cold fall night, but usually 40-100*F...4-38*C... would be the extremes of each end of temp range it will run at.