The NITE system (No Idle Thermal Environment) is a battery operated 12vdc air conditioner with an optional fuel fired heater. The system mounts under the bunk in the sleeper and uses either our NITE duct work or in some model trucks the NITE system can use the factory ducting. The NITE system can save 3700 gallons of fuel per year*. This represents a very quick return on investment. The NITE ac system is powered by four absorbed glass mat, deep cycle batteries.