393 has two A/C systems
Jake,The 393 has an A/C unit aft of the after bunk in the port locker and a larger unit under the setee adjacent to the pulman bulkhead on the end. Since Mystic has such a short season, how much of the boat do you want to cool. The forward unit is Cruisair 16,000 BTU and the aft unit is Cruisair 5500 BTU, give or take a little. The forward unit is used for the pulman and main salon. The aft unit delivers cool air to the main salon (4" duct) and aft cabin (5" duct). The bulk of the coolinig air in the aft goes to the cabin.Installation requires the addition of insulated ducts (that consume a lot of space), a cooling water pump, two overboard discharges, a through hull, two thermostats, two A/C units, a circuit breaker on the ac panel, upgrading the shore power to accomodate two 30 amp. circuits and wiring to some hard to reach places.It is quite an undertaking. http://www.cruisair.com/sheets/L-0854A.pdf tells you what informatation is necessary to size and select a marine a/c system. If you need further information, e-mail me at jentine@hotmail.com Jim