The rear panel of an electronics enclosure includes one or more heat exchangers. The rear panel can be cooling door configured to provide access to the cables and equipment located within the electronics enclosure. Such access can be provided by swinging the door open on hinges like a standard door. In the case where there are multiple heat exchangers, the door can be configured into segments, one segment per heat exchanger, and each segment includes hinges so as to be opened independently from the other segments. In some embodiments, each segment swivels open like a standard door. In other embodiments, each segment is configured to swivel up or down about a horizontal axis. In still other embodiments, each segment is configured to be disconnected from the electronics enclosure and moved out of the way, in which case each heat exchanger is connected using either flexible tubing that can be bent out of the way or quick disconnects. In other embodiments, the entire rear door, or each segment of the rear door, can be configured to slide open and closed like a drawer.