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A self-contained electrical heat pump heating, ventilating and air conditioning unit (HVAC) adapted for mounting at the rear of a bus or other similarly large transport vehicle. The HVAC unit is unitary in construction, compactly arranged and provided with an integrated heat pump. The HVAC unit is s

A self-contained electrical heat pump heating, ventilating and air conditioning unit (HVAC) adapted for mounting at the rear of a bus or other similarly large transport vehicle. The HVAC unit is unitary in construction, compactly arranged and provided with an integrated heat pump. The HVAC unit is specially constructed for use with electric buses or electric/hybrid buses, but can also be adapted for use on buses powered by internal combustion engines.

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1. An HVAC unit for mounting in the rear of a bus comprising a supporting framework, a condenser assembly mounted on said supporting framework, an evaporator assembly mounted on said supporting framework, a compressor assembly mounted on said supporting framework and associated with said condenser a

1. An HVAC unit for mounting in the rear of a bus comprising a supporting framework, a condenser assembly mounted on said supporting framework, an evaporator assembly mounted on said supporting framework, a compressor assembly mounted on said supporting framework and associated with said condenser assembly and evaporator assembly to provide a compression/expansion refrigeration system, said condenser assembly and evaporator assembly being isolated from each other, an ambient air circulation device associated with said condenser assembly, and a conditioned air circulation device associated with said evaporator assembly when in a cooling mode, said condenser assembly functioning as an evaporator and said evaporator assembly functioning as a condenser when in a heating mode, said supporting framework adapted to occupy a finite space in the bus, said supporting framework enabling the selective use of a condenser assembly having a single condenser and a condenser assembly having a dual condenser and an evaporator assembly having a single evaporator and an evaporator assembly having a dual evaporator and a compressor assembly having a single compressor and compressor assembly having a dual compressor thereby enabling capacity characteristics of the HVAC unit to be varied with the HVAC unit occupying the same volume of space when including single and dual condensers, evaporators and compressors.