CHICAGO — A team of researchers at the University of Chicago’s Pritzker School of Molecular Engineering have developed a building material that can change how much heat it absorbs and emits based on the temperature outside. …The new material, which consists of an ultra-thin film, can change its infrared color and ability to emit infrared heat, the invisible heat that radiates from people but also from the sun. …When it’s very cold outside, the material can help keep the building warm by emitting only 7% of its infrared heat. When it’s very hot, it can keep the building cooler by emitting a whopping 92% of it. …The material is only 0.5 millimeters thick but it consists of a fluid sandwiched between two solid layers. One of those layers is made of graphene…but where the magic happens is in the middle fluid layer. …The researchers estimate this material could make your building about 5 to 10% more efficient.