I have a Subway shop..That has a big bank of windows on the S/W side..Probably 6ft by 7ft tall.. That the owner ask me today if there was a ceiling mounted (suspended ceiling) 2ft by 4 ft. unit that could be added..(no heat just air)..that could be hung in existing ceiling grid...I told him I had seen Info of ceiling mounted units..as i have never installed any..I have done mini splits wall mounted..If ceiling mounted..where's the return?..and how do they drain....Thanks for any info ....B,