Air conditioning unit

An air conditioning unit for a first structure defining a first space to be conditioned,

• said air conditioning unit comprising a second structure comprising a lateral wall and a pair of terminal walls connected together to define a second space, a first opening and a second opening realized in a wall opposite to said lateral wall and configured to be faced to respective third and fourth openings realized in said first structure, said air conditioning unit housing an air conditioning arrangement within said second space and comprising a cooling coil, a first ventilation means and a second ventilation means,
• said cooling coil being housed in one of said first and second openings and operable to cool down a first air flow passing through itself and directed towards said first space,
• said first ventilation means being housed within said second space to allow circulation of the first air flow through said cooling coil and
• said second ventilation means being carried by one of said terminal walls to allow circulation of a second air flow towards an environment outside first and second structures,
• wherein said air conditioning unit comprises a fixed divider wall that divides said second space into at least two portions and wherein the fixed divider wall is disposed at a location to fluidically isolate the at least two portions from one another wherein a first portion houses said second ventilation means and wherein a second portion houses said first ventilation means and said cooling coil,
• wherein said air conditioning unit comprises a free cooling arrangement provided with a first damper and a second damper housed within one of said first and second openings and a third damper housed through said lateral wall, said first and second dampers being operable to control the passage of an air flow through themselves between said one of-said first and second openings and said second space and said third damper being operable to control the passage of an air flow through itself between said second space and said environment.