To lower your A/C bill and block heat, the best products for insulation are cellular shades and shutters. They create an airspace "barrier" between your window and the room.
The term "cell" describes each visible side pocket on a honeycomb shade. The more cells there are, the more energy efficient the shade is. Also, the larger the cell size, the better the insulation since the cells "trap" air in the pockets, which helps prevent extreme temperature changes in your home.
Shutters are also very good insulators because they are the thickest, tightest fitting window coverings. They successfully prevent the transmission of air between the window covering and the glass of the window, which reduces energy costs.
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