I live in an area where it gets really hot on some days. Some people place
black film on their windows to keep out the sun. There is a local company
that is selling totally black window screens that cover the entire window.
Those screens look great but I have a question:

Are such screens a great idea for keeping out the heat or is it just a
scam to make lots of money replacing regular screens with new screens that
cover the entire window?? On some types of windows, it means the new
screens would be twice as large as the older screens now on the windows.