The researchers tested a dome with a special roof made of two layers of material and insulation to see how well it kept heat out. They used wireless thermometers to measure temperatures on a sunny day. The roof with aerogel-glass wool insulation worked best, keeping the inside cooler than other roofs tested. This type of roof reduced the temperature difference between inside and outside by 7.7 degrees Celsius, better than roofs with no extra insulation or different types of insulation. The roof blocked sunlight well and kept the inside temperature consistent from top to bottom.