Advent AAC Ceiling Assembly for Non-Ducted Installations

What is an Advent AAC ceiling assembly and what does it do?

The Advent AAC ceiling assembly is the interior component of a non-ducted RV air conditioning system. It mounts inside the RV directly below the rooftop unit and houses the evaporator coil, blower motor, and return air filter. In a non-ducted setup, cooled air is distributed directly into the living space through the ceiling assembly rather than through a duct network, making it the primary air delivery point for your AC system. If your Advent unit is blowing warm air, cycling on and off unexpectedly, or making unusual noise, the ceiling assembly is one of the first components to inspect.

How do I know if this ceiling assembly fits my Advent AC unit?

Fitment depends on your specific Advent model number, which is printed on the data plate of your rooftop unit. The ceiling assembly must match both the model series and the BTU rating of the rooftop unit it pairs with. Measure the opening in your ceiling liner before ordering; the assembly must seat correctly into the existing cutout without requiring modification. If you need help confirming compatibility, contact the United RV Parts team directly by text or call at 817-984-1852 before placing your order. If your RV uses a ducted system, this assembly is not the correct part. For ducted ceiling assemblies, see our Dometic RV air conditioner ceiling assemblies collection for an alternative option.

Can I install the Advent AAC ceiling assembly myself?

Yes. Replacing the ceiling assembly is a manageable DIY repair for most RV owners comfortable with basic hand tools. The process involves disconnecting the existing assembly from the rooftop unit, releasing the mounting hardware from the ceiling liner, and reconnecting the wiring harness and refrigerant lines on the new assembly. Shut off power to the AC system at the breaker before starting. If the rooftop unit itself is being replaced at the same time, verify that the new ceiling assembly is matched to that unit before installation. For RV roof-related work done during the same service window, our RV roof repair installation kits and self-leveling RV sealants cover any resealing needed around the rooftop unit footprint.

What is the difference between a ducted and non-ducted RV AC ceiling assembly?

A non-ducted ceiling assembly delivers cooled air directly into one zone of the RV through vents built into the assembly itself. A ducted assembly connects to a system of air channels running through the ceiling, distributing conditioned air to multiple vents throughout the coach. The Advent AAC ceiling assemblies in this collection are non-ducted only. Using a non-ducted assembly with a ducted rooftop unit, or vice versa, will result in poor airflow performance and incorrect fitment. Check your existing ceiling assembly or rooftop unit data plate to confirm which type your RV uses before ordering.