I had a serious problem with
Deadly-Cold Rays last winter.
My PC is right next to a pair of nice tight replacement windows..
When it's cold out, I can feel the Cold-Rays hitting and penetrating into left my shoulder.
Since I sleep on my left side, that's a very important shoulder..
So, I had some scrap CoroPlas that I cut to (almost) the width of the windows.
I stick them up there at night, when it gets cold. They stopped the Cold-Rays, dead in their tracks!
The blue Cold-Ray blocker also works nicely as a sun blocker.
In the early AM, the sun lights up my LCD monitor & keyboard way too much.
Not only does the blue one block the sun, but it becomes nice and WARM!
My left shoulder is gently warmed by it's radiant heat..
Where can you get coroplas? During election season, you can harvest
many square yards of coro-political signs from the local front yards,
(do this only at 2AM) or call up your local candidates and tell them
you are a big supporter, and want two dozen really large signs..