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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

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. The unique construction of the HVAC unit enables it to be oriented in various modular arrangements so that it can be used as a single module for small or medium sized buses and as dual modules for medium to large size buses.

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[ What is claimed as new is as follows:] [1.]1. A HVAC unit adapted to be mounted externally on the roof of a passenger bus and in communication with the interior of the bus, which comprises a housing having a forwardly facing opening, a rearwardly facing opening and a pair of spaced upwardly facing

[ What is claimed as new is as follows:] [1.]1. A HVAC unit adapted to be mounted externally on the roof of a passenger bus and in communication with the interior of the bus, which comprises a housing having a forwardly facing opening, a rearwardly facing opening and a pair of spaced upwardly facing openings, a pair of condenser plenums mounted interiorly of said housing, one of said condenser plenums forming an air flow passage between the forwardly facing opening and one of the upwardly facing openings, the other condenser plenum forming an air flow passage between the other upwardly facing opening and the rearwardly facing opening, a refrigerant condenser mounted in each of said condenser plenums in said air flow passages, said housing having an air inlet adapted to be communicated with the interior of a bus and a conditioned air passage to return conditioned air to the interior of a bus, a pair of refrigerant evaporator plenums mounted in said housing in communication with said air inlet and conditioned air passages to form air flow passages between said air inlet and said conditioned air passage, a refrigerant evaporator mounted in each of said evaporator plenums in said air flow passages, a fan in each condenser plenum for circulating air through each air flow passage and each condenser, a conditioned air blower mounted in said housing for circulating air from the interior of the bus, in through the air inlet, through the evaporators and out through the conditioned air passage back into the interior of the bus, said housing including at least one motor driven compressor and refrigerant circulation system associated with said condensers and evaporators for conditioning air moving from and to the interior of the bus.