I have an air conditioner that looks similar to this...
...except mine doesn't have the flaps on the sides, leaving a large open gap between the air conditioner and the window frame. What's the best way to fill that gap?
The air conditioner gets taken down in winter, so permanent solutions are no good.
The ideal solution would:
- Be easy to make
- Be easy to put up/take down
- Insulate well
- Keep rainy weather out, and not be ruined by rain
- Keep nosy cats inside
We used to shove blankets in there, but the cats got out. I also tried buying flaps similar to the image, but they failed all 5 tests. I've heard suggestions of cutting out plywood or rigid foam, but I'm curious if there's a simpler and/or better solution.