A significant factor in human comfort levels beside air temperature is the radiated heat which is dependent on the wall temperature. For example, you will feel like you are in an oven
if the wall temperatures are 85 deg F versus 75 F with the air temperature constant at 70 F.
So, what does that have to do with hull color? The most important factor here is are the topsides cored or solid glass. In the north country solid glass topsides sometimes have a layer of insulation
glued to them to reduce condensation
A colored hull is absorbing 20 or 30 percent more solar
energy due to the solar
absorptivity of the surface. This may be 200 watts per meter squared or more versus white topsides. This additional energy will cause the temperature of the inside surface of a solid glass hull to be much higher than a cored or insulated hull.
This higher temperature radiates more energy to the cabinets and stuff hiding the view of the inside surface of the hull. Consequently, the stuff becomes warmer thus radiating more heat to your clothing
and skin. The interior air heats up due to convection with the stuff. So overall, a warmer cabin
In summary, in the tropics you would probably sense a very noticeable difference in the cabin temperature with a colored hull primarily if your hull is solid rather than cored.
A cored hull dramatically slows the transfer of heat into the interior of the boat. So the effect of a colored hull would be muted.