What are some good sliding glass door curtains I can use to conserve energy?

If you have sliding glass doors, then putting up a pair of sliding glass door curtains will definitely help conserve energy. Especially in the winter months, people are looking for ways to conserve, and glass is one of the worst surfaces for letting heat escape, therefore the thicker the barrier you have between the glass and the room, the more energy you will conserve. Good curtains would be thick ones, however the disadvantage to this is that you will not get any light through. In the summer months, use thinner curtains to ventilate the room, this will conserve energy by reducing air conditioning usage, and if they are transparent then you will get the glorious summer sun through too.