I'm remodeling and placing a new HVAC unit in the attic. The dining room is central on the house, adjoined by the living room, kitchen, service bathroom, and (directly or via a hall) all three bedrooms.
The unit is 3 ton, and the house is 1200 square feet.
Also, the dining room will have a tray ceiling notched up 12". The tray will be about 11' by 11', and the dining room 14' x 14'. The intake will be in the upper section, so 9' above the dining room floor.
I want to stop "backwash" of air directly from the outlet vents (esp. in the dining room and kitchen) to the intake. So far I'm intending to keep them as far apart as possible, and also point the vanes slightly away from the intake, but are there any other good options available?
Also, I'm mainly concerned about efficient AC more than heat. This is central Texas.