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The law requires truck drivers to rest after driving a certain number of hours. Most long-haul drivers rest in the sleeper compartment in the truck and it is common for them to keep the diesel engine idling for proving comfortable heating or cooling conditions. It has been estimated that truck drivers idle engines for 6-8 hours per rest period over 300 days per year.
Auxiliary power units consume only a fraction of the fuel consumed during idling and provide heating and air conditioning needed for driver comfort. As per a Department of Energy report, using auxiliary power units (APUs) can save 700 million gallons of diesel and also decrease carbon dioxide emission by 8.9 million metric tons annually. Ordinances have been passed that exclude the weight of a APU while calculation the total legal weight that a truck can carry. This promotes installation of these units.
Diesel engine heating system
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