On my P29, the AC unit was in the hanging locker(same place you are referring to I believe) basically underneath the helm. The return air was in the companionway to the V-berth underneath the electrical panel and the cold air was discharged into the salon basically at the helmsman's feet. A 16BTU unit will still struggle in the heat of the day as the P29 has so much window area and open space but gets quite cold at night.
|