Actually, you can't shed thermal energy, unless it is radiated through the air or conducted through contact. Thermal radiation is the movement of thermal energy from one mass to another. Convection is the flow of air due to thermal energy and differential temperatures. Heat sink with no fan is a good example of convection cooling. aka, heat rises. Put a fan across the heatsink and it really isn't convection anymore because the fan causes the air flow.
We proved that painting the inside surface of our product's aluminum enclosure matte black reduced the internal temperature up to 8% in a convection environment. That was enough for us to add that cost to manufacturing so the product could exceed its performance ratings with enough margin. I was just curious if they had done any testing. I'm fairly certain the difference is measurable, but whether it is significant enough to add the cost is a different equation.