Thinking about giving the outside of your house a fresh paint job? The color you choose can have a big impact on how energy efficient your home can be. Homeowners in warmer climates that choose a lighter color can increase their light reflective value (LRV). (Pure black measures 0% LRV; pure white measures 100%.) By choosing a lighter tint, you reflect light away and your home uses less energy to stay cool. For homes in predominantly colder climates, a darker color can help absorb heat and reduce heating costs.