So we have a cantilevered living room, with windows on three sides. Because we're in New England, we are also dependent on home heating oil for heat. Rather than have the heat go directly out of these windows, we bought cellular shades from Steve's Blinds about ten years ago (because they were the only ones who could make this length), but we need to begin thinking about replacing them. The problem is that we can find no one (including Steve's) who makes/sells cellular shades longer than 144 inches. These windows are 146 inches long. (The last designer who came out suggested we reframe all the windows!) We don't want curtains because we would lose the two small windows on each side when the curtains were open. We are looking for minimal disruption (as it is now) of the view for the energy efficiency tradeoff.
(The stack is very important, as these all but disappear into the top molding. What you see are the five tall windows whose shades need replacing. The other side windows/sliders are not problem windows and can be dealt with easily.)