Windows are the number-one source of heat gain in the summer, responsible for as much as 48% of the cooling costs. The most effective way of preventing this heat gain is by shading the sun before it heats the glass. Exterior solar screens can block up to 90% of the sun’s energy before it heats your windows, dramatically reducing the heat in your home and the load on your air conditioner. Plus, solar screens don’t block the view and they let a portion of the natural light in to illuminate your home. Interior blinds, drapes, and window film all block the sun after they have penetrated and heated the window glass, so the heat is free to radiate into the home.