Idle-reduction technologies are devices that reduce unnecessary main engine idling, typically by providing heat, A/C or power to the cab that would 
otherwise require the operation of the main drive engine while the vehicle or equipment is parked. These devices reduce fuel costs and pollution, and extend engine life.
Eligible technologies include auxiliary power units, battery air-conditioning systems and direct-fired heaters (Class 8 trucks only). For the full list, see the EPA’s website. The Colorado Clean Diesel will fund up to 100% of the cost of these devices if they are combined with a new or previously installed exhaust aftertreatment retrofit; otherwise, the funding cap is 25%.
