A rooftop unit (RTU), also known as a rooftop package unit, is a popular type of commercial air conditioning system. A rooftop unit contains all the components of the HVAC system in one unit. These systems are generally fan-cooled or water-cooled and connect directly to the building’s ductwork. They typically use less energy than other types of HVAC systems and are highly efficient. They are assembled in a factory under ideal conditions.

Unlike a split system, a packaged rooftop unit provides both heating and cooling, eliminating the need for separate HVAC systems. The regulated air is distributed to different areas of the building through registers and ductwork.