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How to line curtains
Select a thermal liner if you'd like to insulate your windows.
If your windows are drafty or thin, save on your heating and cooling costs by lining the curtains with a thermal fabric. The insulation will keep heat in your room during the winter while keeping out drafts from the window.

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* Keep this in mind when selecting your thermal liner. Trim the curtains to the correct length.
* It will also keep cool air from escaping during the summer months. Most thermal liners are made from cotton, polyester, or a blend.
* Unfortunately, there are not many thermal liners available. Some may cost between $20 and $100.
* Because you only have a window with a thermal liner, you won't need to line the windows and ceiling with thermal fabric. Foam inner liner is the base for your lining, and wool fabric insulates your windows from chilling drafts while keeping the curtains closed.
Answer:
It will also keep cool air from escaping during the summer months. Most thermal liners are made from cotton, polyester, or a blend.