What curtains are energy efficient?

What curtains are energy efficient?

Curtains (often called heavy drapes) that are thick, have a lining, touch the floor, have no gaps around the edges and have pelmets are the most energy efficient.
Without a pelmet, hot air rises to the top of the curtain, touches the cold glass of the window, causing the hot air to cool down. This cooled air then enters the room, making the room feel colder. 
Pelmets help prevent this flow of air, making your curtains much more effective and the room more comfortable.

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