The dim window most commonly faces north in the United States. This is due to the orientation of buildings and the angle of the sun throughout the year. In many urban areas, buildings are designed to maximize natural light and minimize heat gain, which often results in windows facing north. According to the U.S. Department of Energy, approximately 40% of residential buildings have at least one window facing north. This orientation allows for consistent daylighting throughout the day, reducing the need for artificial lighting and decreasing energy consumption. Additionally, north-facing windows are less likely to overheat during the summer months, as they receive less direct sunlight compared to windows facing south or west.