Good morning. These are not windows. They are screens. Either Phantom screens or screeneze. We are using a window system by a company called Sunspace, and have begun to write a series of articles on this product. You can read those blogs and learn more about Sunspace at our blog page: Hope this helps ! https://www.designbuildersmd.com/blog. .

Thanks so much for taking the time to respond. I'll look at the site!

Just took a look. How does this Sunspace product compare to Ezebreeze? I can't tell---are the windows replaceable with screens (i.e., screens in spring and summer, windows in fall and winter)?