JoeS wrote:For less than $10 at the local hardware store I picked up this silver foam-sandwich insulating material (comes in 48" width, any length) and a couple of minutes with a pair of scissors gave me a custom cover. The old lightweight bungie helps hold it down when it's windy. I prefer the external one vs. trying to stuff it into the window inside. ...
I know about that material. Wanted to use it. Perfect for this use IMO.
It's actually more effective to block the sun and heat OUTside the glass the way you're doing than inside with conventional shades.
Problem for me was Lowes only sells tha that stuff in something like 30 foot rolls and Home Depot desn't carry it.. At least not near me.