Abstract: A heat exchanger comprises at least a pre-cooling unit, or pre-exchanger, having a longitudinal development along at least a first longitudinal axis, and at least a cooling unit, or evaporator, having a longitudinal development along at least a second longitudinal axis and connected to the pre-exchanger in order to define a fluid-dynamic circuit for the circulation of a fluid, such as air, in said pre-exchanger and said evaporator. The first longitudinal axis and said second longitudinal axis are angled with respect to each other by an angle comprised between 45° and 135°.