It's the annual tweaking of windows for winter. The fans are put away. Some of the unused windows are blocked up with sheets of styrofoam insulation. The north side ones got cellular blinds last year. Round one of measure, buy, and install of new cellular blinds for the south side started this weekend. I've got travel this week, so I'll finish off the rest next week.
One interesting question is whether to replace the old blinds in the sun room. It's walled with windows, and got tight fitting folding blinds a while ago. I'm wondering whether it is worth it to replace them with cellular blinds. From an air flow perspective there is no need. The current blinds eliminated the drafts when the went up. The cellular blinds would add some insulation value. And then there is the question of whether to use the relatively cheap single cell, or spend three times more for dual cell fabric that looks much better.
There is also the question of whether there is any added insulation value from covering some of them with plastic film. Unless it is really cheap I doubt that it is worth it. There is some minor edge leakage on the blinds but not much.