We also use the metallic window covers when campers in storage to keep the shades and curtains from fading and to keep the heat down in the trailer. We live in the dessert.I used the spring loaded curtain rod to hang my blackout curtains and pushed it up behind the valance. Then made a magnetic one for the door. Then we use the pillows in the skylights and fans. It is so dark you don't know if it's day or night