What are the considerations for putting heat/AC air outlets in a ceiling.
One room on the 2nd floor in a house (addition) has floor joists running the wrong way to put ducts in them. One option is running a duct in the attic (insulation not a problem) with outlets in the ceiling. The mechanic says ?I haven't seen it done." The other option is adding a soffit in the ceiling corner of a 1st floor kitchen (not desirable) with the outlets in the floor. Location Minneapolis, system includes AC. The rest of the 2nd floor and house has ducts in the floor.
Booster fan appropriate? Would the system balance for both heat and AC?