We have those, roll a shields. We had them in Germany, when stationed there. So, after living in AZ for 25 years, I told my husband, I would like those on the house. The 2 south windows for sure, and hubby needed a bedroom, dark, to sleep during the day. I wanted privacy to the back of the house. So, all windows are done and I love them. They help the 2 bedrooms to the south at least 5 degrees cooler. The roll a shields are insulated, and can't break in, never paint them. You can allow the amount of light you may wish. Ours are manually operated, no electricity. That is what we had in Germany and very happy with them. Cost? Well, we put up about $3000. and that was 12 years ago.