Air conditioning unit

An air conditioning unit of a vehicle, comprising:

• a conditioning chamber mounted on top of a ceiling the vehicle;
• a fan, with a fan air input and a fan air output;
• an evaporative unit;
• an air tunnel;
• and
• a plenum mounted at a bottom of the ceiling;
• wherein, the fan and the evaporative unit are arranged in the conditioning chamber;
• wherein, the fan draws in entry air to enter the air conditioning unit, then through the evaporative unit, to condition the entry air to produce conditioned air;
• wherein, within the conditioning chamber, the fan is positioned and configured such that at least 30% of an area of the fan air output are positioned above an average top surface of the evaporative unit, and that air from the at least 30% of the area of the fan air output is directed towards a wall of the conditioning chamber prior to redirected downwards and through the evaporative unit;
• and
• wherein the air tunnel connects the fan air input to the plenum;
• the plenum comprises a plenum air input and a plenum air output;
• wherein the entry air goes through the plenum air input to the fan, and the conditioned air goes through the plenum air output as an output of the air conditioning unit.