Power systems and enclosures having improved cooling air flow are disclosed. An example power system includes an enclosure; an air inlet location at a first location on an exterior of the enclosure to permit intake of air from the exterior of the enclosure to an interior of the enclosure; an air exhaust location at a second location on the exterior of the enclosure to exhaust the air taken in through the air inlet location; and an air routing path defined by the enclosure to direct the air from the air inlet location to the air exhaust location, in order: through one or more first compartments in the enclosure, the one or more first compartments containing at least one of a compressor, a generator, or power conversion circuitry; and through one or more second compartments, the one or more second compartments comprising an engine and a muffler.