A one-piece rear-mount unit and hermetically-sealed system, the alternator-powered TE-Series All-Electric HVAC system reduces operating costs by eliminating engine-driven compressors, piping, fittings and hoses while decreasing emissions. Electric compressors are integrated with microprocessor control. The system is sealed, charged and tested at the factory. Maintains big unit capacity at all bus speeds. Uses energy-efficient R-407C refrigerant.