I’d like to use ducted mini-split HVACs for a new home and i have some questions.

- Do ducted systems come in a wall unit or only ceiling units?
- I have about 12" of space between the ceiling and the roof. Is this enough space for a ducted ceiling unit? What would the minimum space required?
- If there is no attic or direct access above the ceiling, can a ceiling unit still be used? What about access to the unit for servicing? Can the unit just be removed from the ceiling?