[video width="1280" height="720" mp4="//cdncn.goodao.net/cndairui/Curtain-showroom9.mp4"][/video]     As the blackout lining on these curtains blocks out sunlight they help keep your room cool as well as dark. This lining also adds an extra layer of insulation to the curtains, giving them the added benefit of being thermal. They protect against both heat loss and heat gain, regulating the temperature of your room so you’re kept warm in winter and cool in summer.