I am not an AC fan, but if my charter boat has AC I do find it helpful to put it on in the evening during meal prep time. It cools down the interior during late afternoon sun, cools down the galley and dries out the interior somewhat. This is usually the time everyone is showering off and changing to dry evening clothes, except the kids who basically live in their bathing suits and cannot be bothered to change their clothes.

Does come in handy during rainy season so you don’t have to do the hatch closing drill