Thank you for the quick response! But what about a solution that isn't as permanent once you put it up?

Yes, just what Angel said! Lowe's carries several styles made by brands GILA and Brewster. Or, try a company like Llumar. If you decided it blocks out too much light, you can just peel it off and try a lighter shade or print.

If you view some samples and choose the right film for your home and exposure you will never want to take it down. There are not as many choices available in the DIY products and the technology is not the same as what you will find in a professionally installed film from Llumar or Vista.

If you want to have control/the ability to change you have to have an operable shade or blind. There are some static cling films that can be removed and reapplied but they do not have the performance or optical clarity of adhesive window films.

Would you consider treating the two windows (both sets) as one window and hanging black-out lined draperies from above the top smaller windows? It would look very elegant and heighten the room. Good luck from Montreal!

Basically almost ceiling to floor panels on each side of the fireplace in case that wasn't clear.