If you're able to go above and beyond to help us during this important time, please consider making an additional financial contribution. Click here to contribute. One of the most overlooked components of a house is the window and door screens. Homebuyers generally accept the screens that are there and donât really think about them until they become damaged and need to be replaced. But are the screens the right ones for your lifestyle? Sun Screens The function of a sun screen is to prevent UV rays from ever reaching your windows. Sun screens work in three ways: ⢠Shading efficiency â the amount of shade created between the screen and exterior pane of glass.