Heat exchanger, air conditioner arrangement and switch cabinet

Heat exchanger, in particular a heat exchanger of an air conditioner arrangement that is configured for air conditioning in a switch cabinet, wherein the air conditioner arrangement comprises a housing that has a cabinet side housing region and an external housing region, as well as a partition wall element that is arranged between the cabinet side housing region and the external housing region and separates the cabinet side housing region and the external housing region from each other fluidically, with a pipe system configured to transport a coolant, wherein the pipe system has a first manifold and a second manifold and multiple pipe elements, the free ends of which open into the manifolds, wherein at least of the manifolds has a coolant inlet and at least one of the manifolds has a coolant outlet, which are connected to each other in a fluid-conducting manner by the pipe system, wherein the pipe elements are connected with two mounting plates which are arranged at a distance from one another and surround the pipe elements in gas-impermeable manner, so that the heat exchanger can be installed in the partition wall element in such a manner that in the assembled state the manifolds are arranged in the external housing region and at least portions of the pipe elements are arranged in the cabinet side housing region.