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Also, make sure to keep on moving your rug around. Many people leave their rug where it is for months and months, only to discover when moving it that the floorboards underneath it is a darker colour than those surrounding it. Make sure not to let this happen. If your room is especially sun-drenched, you probably shouldnt have a rug covering the hardwood floorboards.
Final thoughts So those are your main options. The main thing is to reduce the amount of UV getting in, which you can accomplish by installing a number of different window treatments (all those aforementioned).