Rooftop packages are engineered specifically for commercial use, meaning they can run in harsher conditions and under more strain from usage.
Easy to service
The unit is designed to be easy to maintain and service. The panels that protect the internal components can be easily removed, making the repair/maintenance process much more efficient than a traditional air conditioning/heating unit.
For large-scale operation, these units are more cost effective than if you were to install individual units offering the same output. Rooftop package units are also easier to service and maintain from a technicians point of view, meaning that servicing costs are better relatively speaking.