Rooftop Unit

This chapter covers the key functions, components, and applications of Rooftop Units (RTUs)—self-contained HVAC systems installed on building rooftops. RTUs are widely used in commercial settings like retail stores, offices, and schools due to their compact footprint and all-in-one heating, cooling, and ventilation design.

Readers will learn:

• How RTUs operate and distribute conditioned air

• Key components: compressors, heat exchangers, supply/exhaust fans, economizers

• Typical capacities, voltages, and airflow configurations

• Curb installation requirements and crane considerations

• Maintenance and service access best practices

Figure: Diagram of RTU with airflow path and key internal components

Designed for technicians, APMs, and facility teams, this chapter includes visuals, example models, and links to video walkthroughs of RTU installation and service procedures. It’s ideal for field reference and onboarding new team members.