Some embodiments provide a rooftop HVAC assembly including HVAC equipment and a screening system. In the present embodiments, the HVAC equipment is mounted operably on a roof of a building and the screening system is assembled operatively so as to surround the HVAC equipment. The screening system includes a screen panel that is adjustable between a lower, closed position and an upper, open position, e.g., by moving at least part of the screen panel selectively upwardly or downwardly. Further, some embodiments provide a screening system for a rooftop HVAC assembly comprising HVAC equipment and the screening system. In the present embodiments, the screening system is configured to be operatively assembled so as to surround the HVAC equipment when mounted operably on a roof of a building.