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

The THERMWELL Frost King AC43H Air Conditioner Weatherseal Tape is a simple but highly effective solution for sealing window AC units and eliminating the drafts, vibration noise, and dust gaps that tend to show up around older installations. The foam is dense enough to provide a firm, reliable seal, yet still compresses easily to fit uneven gaps without tearing or crumbling. At 2‑1/4 by 2‑1/4 inches and 42 inches long, the size is generous and works well for both side and top gaps on standard window units. During installation, the adhesive held securely without needing reinforcement, and once in place, the foam stayed put even through temperature swings and daily AC vibration. The material also rebounds well, maintaining its shape rather than flattening out over time. For anyone installing a new unit or tightening up an existing one, this weatherseal tape offers dependable performance, easy handling, and a noticeable improvement in insulation and noise reduction.

Initially seems like it's too lightweight to work, but once you squeeze it in there it works pretty well. Cuts down on noise, super easy to work with, good price. Note that it doesn't self-adhere, you need to bring your own tape if you want that.

This sponge stuffer is a MUST for around my window air conditioners & between the windows. Keeps BUGS OUT!!! Necessary to buy it every year, but it's well worth the price, but I wish they did offer a bigger bag. HIGHLY recommend this weather seal, no creepy crawlers in this house!

works great

I buy this product every year to put around my a/c unit. It’s nice and wide so perfect for the job.

Dense yet easily manipulated. My apartment building’s maintenance installs our air conditioners, and I had to order this after the fact, but it was easy to shove into the gaps. Ideally this would be used during installation, but so far it insulates well! (Used on upper gap in photo)

Arrived as stated and does the job I bought it for. I use these for around my window a/c unit but I also live in a VERY old apt that has many cracks! These can be cut easily for use in sealing cracks around old windows in conjunction with the plastic I also use and these work wonderfully. Easy to install and I suggest the grey. Good quality! Good packaging! Great seller! Recommend!!

Works as intended and easy to understand