Air Conditioning
Hi Helen and Mark, our P42 is about the same size and layout of your boat. It came equipped with two Marine Air reverse cycle units; 16,500 BTU for the main cabin, which was installed in the starboard settee and a 9,000 BTU for the aft cabin installed inside the aft berth, behind the fuel tank. The Little Giant sea water pump that feeds both heat pumps was installed in the starboard side bilge locker next to the companion way step.
The heat pumps work great as long as you have a good supply of AC electricity either from a Genset or shore power connection. Their AC electrical draw is way more than a 12 DC battery bank can handle.