A rooftop packaged HVAC unit, often called an RTU, is a self-contained heating and cooling system typically installed on the roof of a commercial or light industrial building.

Unlike a split HVAC system, where the indoor and outdoor sections are installed separately, a packaged rooftop unit places the major refrigeration and air-handling components inside one cabinet.

What components are inside a rooftop unit?

Depending on the selected configuration, a rooftop packaged unit can include:

• Compressor
• Condenser coil
• Evaporator coil
• Supply-air fan
• Filters
• Heating components or heat-pump circuit
• Fresh-air intake
• Controls and safety devices

Where are rooftop units commonly used?

RTUs are widely used in buildings where a central duct system can distribute conditioned air directly from the roof-mounted equipment.

Typical applications include:

• Retail stores
• Supermarkets
• Restaurants
• Offices
• Schools
• Warehouses
• Workshops
• Commercial buildings

Why choose a packaged rooftop unit?

A rooftop unit can simplify mechanical-room requirements because the main HVAC equipment is located outdoors on the roof.

It can also provide a compact solution for cooling, heating, ventilation and air distribution through one packaged system.