Summer is ramping up and I am trying to do what I can to keep the house cool. I have one room that gets hit by the sun all day. Has anyone bought the insulation sheathing (styrofoam with a reflective layer) for their windows? Do you think it’s worth it to spring for 2”, or would 1” work well enough? Thinking I would just buy a couple of sheets and cut them to size since the window is large.