[roger]

if it is minus a hundred degrees out and i am going to sit for the morning hunt, I will leave it in the vehicle overnite. and put it in the cased truck box for travel to the stand, just so it doesnt have to go through all the temp changes/ fogging scopes, (rusting to lesser extent) potential icing problems etc...
if im just truck hunting in the am. i bring it in a take it to a warm truck from the motel for the same reasons.
most of the times thou it ends up in the room with me.