An apparatus for cooling external environments, comprising a pump (5) which comprises an inlet conduit (7) destined to be connected to a water supply source, and a delivery conduit (9) connected to at least a nozzle (101, 201, 301, 401) for atomising the water, a motor (6) powering the pump (5) and a pressure regulator (11) for varying the water pressure delivered to the at least a nozzle (101, 201, 301, 401), in which the pump (5), the inlet conduit (7) and the delivery conduit (9), the pressure regulator (11) and the motor (6) are all housed in a casing (2) provided with a handle (3) and wheels (4), the casing (2) being conformed in such a way as to be transportable by a single person.