Abstract: An air conditioning kit for vehicles, comprising: an auxiliary compressor, which can be powered with an energy source that is independent of the engine and which optionally coincides with the original battery of the vehicle, the auxiliary compressor being interposed between an intake branch and a delivery branch, a first connector, for the connection of the intake branch to the intake conduit, defined by the circuit, of the primary compressor, a second connector, for the connection of the delivery branch to the delivery conduit, defined by the circuit, of the primary compressor, an apparatus for intercepting at least a part of the lubricant that is usually dispersed in the heat carrier fluid, in order to prevent the complete emptying of lubricant in the primary compressor and/or in the auxiliary compressor.

Abstract: An air conditioning system for vehicles, which comprises a closed circuit affected at least by a primary compressor actuated directly or indirectly by the engine of the vehicle, by a primary condenser and by an evaporator, all of which can be passed through in sequence by a heat carrier fluid that circulates in the circuit, for the execution, with engine running, of a primary refrigeration cycle, the closed circuit connected to a branch arranged parallel to the primary compressor and affected by an electric auxiliary compressor, the branch can be passed through by the heat carrier fluid for the execution, with engine switched off, of an auxiliary refrigeration cycle, the system comprises an electronic control and management unit configured to assign the auxiliary compressor an operating mode composed of predefined alternating intervals of power-on and power-off; during each power-on interval the auxiliary compressor operates at a preset rotation speed value.

Abstract: The invention has the object of providing an air-conditioning system for motor vehicles or the like, with two separate and independent refrigerating circuits having heat exchangers on the same air flow line, one of the two circuits having its compressor that receives mechanical power from the vehicle engine and thereby can be used when the motor vehicle itself is running, and the other circuit has the relevant compressor that receives mechanical power from an electrical motor which in turn receives power from the mains current and is instead usable during the stop when the vechicle is parked.