Sellers can brighten a haunted house by swapping out heavy drapes for lighter curtains, adding layered lighting to illuminate rooms warmly, repainting walls in warm neutral tones, and refreshing exterior curb appeal with landscaping and clean fixtures. These steps reduce gloomy or moody atmospheres that feed ghosts’ reputations, making the home feel inviting, comfortable, and livable to buyers. Brightness helps shift perception from eerie to charming.