Solar Curtains - Keeps the Sun Out and the Rooms Cooler in Hot Temperatures - 81" x 30" Keep your heating and air conditioning costs down with these reflective solar curtains. Just hang them on a curtain rod between your curtains and the window. During the cold months, solar curtains prevent heat loss and reflect heat back into the room. On sizzling summer days, they keep the sun's rays from penetrating and heating up the house. They also protect furniture from sun fade and increase your privacy.