Ducted AC Unit to Ductless Conversion

Thread resurrection! I have an Advent that is ducted, however, to switch between having the air blow from the grill to blow through the vents, there are three sliding doors on the grill, no other controls other than the thermostat on the wall. It could be as simple as just finding the correct grill.

My Jayco has a ducted A//C and all the controls are right on the unit. No remote controls. Check yours....

They use different control boards for ducted and non. You *might* be able to buy a new control board, or maybe discard the non ducted thermostat and wire the ducted t-stat, but I've not seen a non ducted unit, so I cannot guarantee it.

Would it be possible for the controls of a non ducted be modified to work on a ducted

Generally the biggest difference is in the controls and wiring. Ducted units have a relays and wiring that allows them to be controlled from a remote low voltage thermostat. Non ducted have the controls on the ceiling assy. that are generally line voltage.

I see that they are different but just trying to figure out how, whats different. Could be a simple DIY modification hat could make it work.

further research shows the top units are different for non-ducted use as the red print at the bottom of this page says
Atwood 15033

looks like you can buy a non-ducted ceiling assembly
Atwood Air Command Non-Ducted Ceiling Assembly

You would also have to deal with the difference in control wiring.

I have the top unit, brand new never installed. What I am missing is the lower portion that would house the vents and the metal lower plate for install. If I purchased the non ducted lower vented set up, would that work and bolt right on, or would I need to modify it further?

What exactly is the difference between a non ducted and ducted other than the lower piece.