To be frank, I’m not sure if replacing the single pane with double pane is: A - something I can afford at the moment and B - something I can DIY (which adds to point A).
I have a feeling that the windows are a large part of my electricity usage (due to AC constantly running), I have them “foiled” and really tempted just to board them up. Before I go to that extreme, I was thinking maybe there’s something I can attach to the outside that would essentially add that 2nd pane, or at least block some sun from hitting the glass.
suggestions?
I don’t think shutters will provide much of an R value, but they might block out some sun. Window insulation film is a thing that exists, and might be your best budget bet. Window treatments also work well, and vary in price.
People usually think of this for cold climates and winter but it works year round. That stuff can cut hundreds a month off bills