We have 2 Marine Air units 16000 btu and 7500 btu. The larger one is installed under the forward port settee in the salon the smaller is installed in the port closet in the aft cabin. They have work well over the past 10 years. One feature is the humidity mode that we use when we left the boat in the Rio Dulce, Guatemala 6 months each year for 5 years. The boat would be just as we left it in June when we returned in January.
With regard to a generator we used a Honda 2000 for the years we had Up Jinks in Central America. It is quiet and efficient. The only down side is it uses gasoline which we kept in a 5 gallon can secured on the deck. While cruising we would keep the generator in the space between the laserettes just in front of the