why pale blue paint is used on the porch ceilings of many older homes in New England? There are actually a number of possible reasons. The blue paint is said to reflect light. To anyone standing inside the house, the day would seem brighter, even if it were overcast. Some say it keeps the porch cooler in summer. Still others believe that blue chases away evil spirits. In the South, especially in South Carolina, the ceiling porch blue is called haint blue (haint being a spirit or ghost) and is used to ward off evil spirits. Some people also believe that the color discourages insects that mistake it for the open sky and avoid it for fear of being caught in the open and eaten by flying predators. Some just do it because it is pretty.