Room darkening energy savings. The microfiber window panels help to reduce the amount of light that comes in through your windows. This not only allows for darker rooms but helps to keep heating and cooling costs down by insulating your home by cold blocking and heat blocking. This is a big plus for eco-friendly customers that want to do everything they can to be energy efficient. These solar blocking panels are perfect additions to your living room or bedroom. The darkening curtains are the best source for all of your room darkening and light blocking needs.