Abstract: An air compressor system of the type having fluid-treating components including a compressor and downstream coolers for hot fluids emanating from the compressor, characterized by a substantially airtight cabinet enclosing the fluid-treating components and including air outlets and an ambient air inlet, a device over the air inlet to clean incoming ambient air, and wherein the coolers are of the air-cooled type. In preferred embodiments, a device at the inlet, preferably a water-scrubbing air cleaner, cools incoming ambient air. The cabinet preferably includes a substantially vertical surrounding wall section and a removable cover engaged therewith. The cabinet wall section preferably includes at least two perimetrical portions removably interconnected to allow separation and thus to allow ready accessibility to fluid treating components. A highly preferred feature is a jack or other similar device for raising the cover for inspection and minor service.