Abstract: 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.

Abstract: A heating, ventilating and air conditioning unit adapted for mounting on the roof of a bus or similar vehicle. The HVAC unit is self-contained, lightweight and provides adequate cooling, heating and ventilation to a bus passenger compartment or the occupant compartment of a similar vehicle. The HVAC unit has a unique cross-pattern arrangement of evaporator and condenser assemblies which enables air distribution from the system to function in a ducted system or a free blow system depending upon orientation of the condensers and evaporators. The HVAC unit is of compact construction and includes modular characteristics provided by the allocation of one fan to one condenser and one blower to one evaporator to enhance system performance and system redundancy. The HVAC units include diagonal symmetry of components which further improves modularity, commonality and serviceability.