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Energy-saving tip number 12...
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When you cover your windows at night to keep the heat in, use thick window coverings and place a mylar blanet over them on the side facing the room to reflect the heat back into the living space.
In the morning, don't uncover the windows until the space between the window and the covering is a higher temperature than your living space is.
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This works in the summer, too, to help keep your home cooler. When it is hot outside, cover the windows to keep the heat out and the cool temperature inside.
Also, make sure to cover windows to prevent direct sunlight from shining into your living space.