Abstract: Disclosed herein are methods, systems, and devices for allowing access for maintenance and servicing of environmental control systems of prefabricated equipment enclosures. In one embodiment, an enclosure includes a first wall, a first environmental control unit, and a first door. The first door is mechanically coupled with the first environmental control unit and the first wall. The first door is configured to have a first closed position allowing in-service operation of the first environmental control unit for an internal space of the enclosure.