Climate change is turning up the heat in Boston, making homes across the region hot places to be in the summer. Boston's traditional winter-focused design is being stressed by climate change, as buildings trap heat in summer due to insufficient cooling and ventilation, according to Julia Nassar of the Metropolitan Area Planning Council. According to a Yale Climate Connections report, experts advocate cool roofs, which use reflective coatings or materials to lower heat absorption and ease air conditioning demand. Nassar's group has developed an online assessment that allows homeowners, roofers, and others to input information such as a roof's slope and materials to determine the roof's suitability for a cool roof transition. In addition to this tool, the council also released a map to help residents and municipalities in identifying buildings in the Boston area that could benefit from cool roofs.