Roof-top air-conditioning system for a vehicle, particularly a bus

A rooftop air-conditioner operating according to the cold vapor-compression principle using an internal coolant for a vehicle, in particular a bus, in which:

• a sequence made up of a high-pressure side heat exchanging device with an associated fan devices, followed by an expansion device and an evaporation device that use the internal coolant;
• an internal channel arrangement, relative to the rooftop air-conditioner, to convey air to be conditioned, which exchanges heat with the evaporation device;
• and a modular construction of a high-pressure side heat exchanging device with associated fan device in its own housing
• are provided;
• characterized in that
• connections for coupling of identical high-pressure heat exchanging device modules can be provided, prepared or designed;
• and
• the modules are designed for grid-like coupling of modules of identical output and/or modules of stepped output.