That just gave me an idea. Not a very practical one, but something that could be done in the winter...and possibly summer. Not sure how much heat it would save.
What if you cut out rigid foam to fit into your windows and what not so that, say, in the winter, at night when the sun goes down, you would fit those into your window then close the blinds. And in the summer, if you wanted to shade certain rooms, you could just fit it into the window in the summer during the day.
Wonder how much energy that would save? Or would that be considered a fire hazzard in case you had a fire in your house and it would be blocking your exit...although it would just be a fitted foam piece...not something that would lock in.
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