Most of the time, the question is: why leave the truck running? Would you leave your car running in the parking lot while you do your errands? Of course not. However, for truckers that must stay in their trucks, there is a question of security and comfort during extreme temperatures that has to be taken into account. During intense cold periods or periods of excessive heat, it becomes essential that the engines run at idle to get heat or air conditioning. For the rest of the time, which counts for most of the year in our area, there is no justification.