If you find a white and black automobile parked next to each other and the sun is shining brightly, make sure no one is watching and be careful not to scratch the cars with your rings or belt buckles and feel the difference in temperature. Which one is hotter? Same as your house roof, which one is hotter? Any idea what all that heat does to the engine compartment? Compare whit it does to the interior passenger area!
Keep it simple, keep it green, keep it white/lite…