THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape, 2-1/4 by 2-1/4 by 42-Inch

But not for A/C.I got this to go behind a headboard that was bumping the wall, and with a bit of double-sided tape it works perfectly!

Great quality, great price. Not only works great to seal air conditioners but has other uses as well. I recently used to close and fill in the gap beteeen the back seat of my car and the rear window that leads to the trunk. A short time ago, a bee flew into my car trunk. Thought I shooed away only to find it in my car by the rear window. How'd it get there.....flew into the car from this gap. How to solve tte problem? After much thought, came up with the idea to try this insulation, perfect length and width.It did the trick. Problem solved. Highly recommended.

This foam helped significantly to keep out the draft entering the house via the window where my room air conditioner unit is installed.Cold air was entering the house thru the gap where the top and bottom windows meet until now. I easily shoved the foam in the gap between both windows and now the room isn't as cold as before.

Same as before

Product was good quality and did what I needed it to do. However it still amazes me how much this stuff can cost given how inexpensive it is to make, lol.

I've used these were great results, no frozen pipes, around my house the past 10 years.They're very easy to use, are very well insulated, seal the pipes I've used them on very well, and stay where they're put.I've used them instead of the styrofoam covers that are typically used because they just seem to last longer and don't look obnoxious on the house.The thickness is good without being overwhelming. I've used them for 10 years and never had an issue with any pipes freezing. Highly recommended.

Finally! A proper seal on my A/C. Window is STUFFED!

Good insulation for window and doors.