sounds fine, keeping the UV outside the glass is the way to reduce solar heating - same reason folks have awnings in hot climates or use reflective solar film on the glass

Bill

clever idea

What happens when it's windy?

alfie they blow in the breeze I thought
about a tie down outside but I raise them
from inside by opening the window.I haven't
figured out how to tie them down once they
are down and close the window
This is just like you to give me a problem
to solve (LOL).
Blueangel

I'd be concerned that the sun would eventually rot the fabric and the threads holding the whole thing together. Would not functional wooden shutters be easier all the way around and more eco friendly?

Thank you Carol
I did not even give
that a thought.
and yes I do replace the
blinds every couple of years
for that reason.
Again thanks for opening
my eyes.

Blueangel

These may or may not be in your price range, but this is what is used up here.

kioni

Here is a link that might be useful: Exterior window shades

Thanks Kioni
I will look into
this company and
see if there is something
local.
Blueangel